The RF Exposure Evaluation Nobody Did
(And How to Do Yours Tonight)
The rule that used to let most of us off the hook was deleted years ago, and a lot of hams never noticed. Nothing gets filed, nothing costs money, and it takes about ten minutes.
Here is a question that makes a surprising number of licensed operators shift in their seats. Have you done an RF exposure evaluation for your station?
If your answer is “a what?” or “I run a hundred watts, I don’t need to,” you are in very large company, and you are also working from a rulebook that stopped being true on May 3, 2021.
This is not a scare piece. Almost every ordinary ham station passes comfortably, often without changing a thing. But the rule that used to exempt most of us automatically is gone, and what replaced it asks a different question that a lot of people have never been told about.
The whole thing takes about ten minutes, nothing gets mailed to anybody, and there is no fee. Let’s just do it.
The Table That Used to Save You Is Gone
For years the amateur rules contained a simple table. It listed each band next to a power level, and if you stayed under that number you did not have to evaluate anything at all. Five hundred watts on 80 meters. Fifty watts on 10 meters and on VHF. That was the whole test, and it is the rule most of us learned.
The FCC deleted that table. The order was adopted in November 2019, the new rules took effect on May 3, 2021, and existing stations were given two years to catch up. That grace period ended on May 3, 2023. There is no amateur-specific power exemption any more.
What replaced it is not harder, but it does ask a better question. The old rule asked only how much power. The new one asks three things at once.
| The old rule, before May 2021 | The rule now | |
|---|---|---|
| What it asks | How much power are you running? | How much power, how far away is the nearest person, and what band? |
| Who was exempt | Most hams, automatically, by band and power | Nobody automatically. You either qualify under the new test or you evaluate. |
| The best way to pass | Turn the power down | Move the antenna further away. Distance is worth far more than power. |
| Who it covers | New installations at the time | Every station, however long it has been up. The transition ended May 3, 2023. |
There is one point in the FCC’s own order that clears up years of confusion, and it is worth reading twice. Being exempt from doing an evaluation was never the same as being exempt from the safety limits. The limits always applied to everybody. The exemption only ever excused you from having to check.
Distance Does the Heavy Lifting, Not Power
If you take one thing away from this article, take this. Radio energy spreads out as it travels, and it thins out with the square of the distance. Double the gap between your antenna and the nearest person and the exposure drops to a quarter. Triple it and you are down to a ninth.
Power does not behave anything like that. Halving your transmitter output only halves the exposure.
So when somebody worries about RF safety and immediately reaches for the power knob, they are pulling the weakest lever available. Moving the antenna ten feet further from the patio, or getting it up higher above head height, does vastly more than dropping from a hundred watts to fifty.
This is also why the shape of your station matters more than its size. A modest hundred watt station with a wire antenna strung along a fence at shoulder height, right where people walk, can be a harder case than a much bigger station with the antenna on a tower. It is not about how loud you are. It is about who is standing in front of it and how close.
One related point that trips people up: the handheld radio you hold against your face is a genuinely different situation from an antenna in the yard, precisely because the distance is measured in centimeters rather than meters. Low power does not automatically mean low exposure when the antenna is that close to your head.
Your Family and Your Neighbor Are Judged Differently
The rules use two different sets of limits, and knowing which one applies to whom explains most of what feels strange about this subject.
The stricter set applies to the general public. People who have not agreed to anything, do not know your antenna is there, and cannot be expected to manage their own exposure. Your neighbors, people on the sidewalk, visitors. In the VHF range this limit is five times tighter than the other one.
The more permissive set applies to people in a controlled situation who understand the exposure and can do something about it. Here is the part most hams have never been told: the amateur rules specifically allow you to assess members of your own immediate household against this more permissive standard, provided they have actually been given the relevant information and training.
That has a practical consequence. The binding constraint at a typical station is almost never your own family. It is the neighbor on the other side of the fence, because they get the stricter treatment and because you have no control over when they are in their own yard.
Two more things worth knowing without getting into the arithmetic. First, the limits are averaged over time, not measured at the instant of transmit. That averaging window is where most amateur stations quietly pass, because a normal conversation involves a great deal more listening than transmitting. Second, the tightest limits of all sit in the VHF range, roughly the 6 meter, 2 meter and repeater end of things, because the human body happens to absorb energy most efficiently around there.
The Whole Job, Start to Finish
Gather four pieces of information. None of them require test equipment.
Your power. What you actually run, not what the radio is capable of. If you never turn it past fifty watts, use fifty.
Your mode and how much you talk. This matters more than people expect. A mode that transmits continuously is a very different case from single sideband, where you are only actually transmitting during the parts of a sentence with sound in them, and only for part of the time you are on the air at all.
Your antenna and roughly what it does. A wire dipole radiates in a very different way from a beam pointed down the garden.
The closest a person can get. Walk outside and look. Not where people usually are. Where they could be. The neighbor’s deck. The spot where your kids actually play. The path to the trash cans.
Put those into a calculator, and it tells you the minimum distance people need to be from the antenna. Compare that to the real distance you just measured. If the real distance is greater, you are fine.
If it is not, you have options, and in rough order of how well they work: move the antenna further away, get it higher up so nobody can be beside it, put it somewhere people cannot reach, transmit less on that band, or turn the power down. Notice which one is last on the list.
Nothing gets sent to the FCC
This is the part that surprises everyone. There is no form. There is no filing. There is no fee. You do the evaluation, you fix anything that needs fixing, and that is the requirement met.
You are not legally required to keep a written record of it either, and anybody who tells you otherwise is overstating the rule. That said, the ARRL recommends keeping a copy in your station records and so do we, for the obvious reason: if a neighbor ever raises a concern, or a question comes up during a permit or zoning discussion, a sheet of paper showing you worked it out is worth a great deal more than saying you are sure it is fine.
One more thing. This is not a once-in-a-lifetime job. When you meaningfully change the station, put up a different antenna, move one, or start running much more power, you go through it again.
Let Something Else Do the Arithmetic
Nobody should be doing this on paper. There are two free tools worth knowing about, and you do not need both.
Exposure Forge is ours, it runs in your browser, and it was built specifically because the existing tools assume you already understand the terminology. It asks plain questions and explains what each answer is for as you go. Nothing to install, no account, free.
The ARRL’s RF Exposure Calculator is the long-established option and is also free to anyone, member or not. It asks for power at the antenna, your mode and duty cycle, antenna gain and frequency, and gives back the minimum safe distance in feet and meters.
Two honest caveats about any calculator, including ours. Neither is designed for an antenna within about eight inches of a person, so a handheld pressed against your face is a separate conversation. And a directional antenna does not radiate evenly, so if you have a beam you may need to run the numbers more than once for different directions.
If you have more than one antenna
Everything above assumes one antenna at a time, and most articles stop there. The rules do not.
If you have several antennas or several radios, you are expected to consider their combined effect rather than evaluating each one on its own and declaring victory. A tower with an HF beam, a 2 meter vertical and a UHF antenna on it is one situation, not three separate ones.
In practice this rarely changes the answer for a typical home station, because you are usually only transmitting on one of them at a time. It matters much more if things genuinely run at once, such as a repeater or a packet node that keys up on its own schedule while you are working somebody on HF.
Six Things You Will Hear on the Air That Are Wrong
“I run low power, so I’m exempt.” That was the old rule and it was deleted. You may well still be fine, but you now get there by considering distance and band as well as power, not by looking up a number in a table that no longer exists.
“It only applies to new antennas.” No. Existing stations were given a two year grace period specifically because the rules reach them, and that period ended on May 3, 2023. A tower that went up in 1994 is in scope.
“I have to send it to the FCC.” No. There is nothing to file, no form, and no fee.
“If I’m exempt, I can’t be over the limit.” These are two different things, and the FCC said so directly. The exposure limits apply to every station all the time. An exemption only ever meant you did not have to run the check.
“My family is the problem.” Usually the reverse. The rules let you assess your own household against the more permissive standard if they have been properly informed. It is the neighbor who gets the strict treatment.
“Just turn the power down.” It works, but it is the least effective tool you have. Distance does the heavy lifting. Move the antenna first.
Questions People Actually Ask
What happens if I just don’t do it?
Honestly? Probably nothing, for a long time. We went looking for FCC enforcement actions against amateurs over RF exposure and could not find one in the public record, which is not the same as saying none exists. The realistic risk is not a knock at the door. It is a neighbor raising a concern, or a zoning or permit question, and you having no answer ready. That is a bad afternoon you can avoid for ten minutes of work.
Is amateur radio dangerous?
Operated normally, no, and nothing here says otherwise. The overwhelming majority of ham stations pass this comfortably without changing anything. The rule exists to catch the unusual cases, and it is worth ten minutes to confirm you are not one of them.
Does this apply to my handheld?
Yes, and it is the case where low power is least reassuring, because the antenna is inches from your head rather than yards away. The general guidance is sound and boring: do not transmit with the antenna touching your face, and use a speaker mic or a remote antenna when you are running higher power or transmitting for long stretches.
Do I need to do one for every band?
Work through the bands you actually use, because the answer genuinely changes with frequency. If you only ever operate on two bands, evaluate those two.
My antenna is in the attic. Does that change anything?
It changes the distances, and usually not in your favor. An attic antenna can be a good deal closer to people than a mast in the yard, with a bedroom ceiling between them. It is worth measuring rather than assuming.
What if I fail?
Then you have learned something useful, and the fix is usually mundane. Move the antenna, raise it, fence off the area right underneath it, or operate that band less. Very few hams end up having to make a hard choice, and the ones who do are usually glad they found out from a calculator rather than from a neighbor.
Is there an official method?
Yes. The FCC’s own rule points at its OET Bulletin 65 and the supplement written for amateur stations. It predates the 2019 changes, so treat its worked examples with that in mind, but it is the method the rule itself names.
Ten Minutes and You're Done
Exposure Forge walks you through the whole evaluation in plain English and tells you the distance you need. While you are there, Ground Forge does the same job for station grounding, which is the other thing everybody means to sort out and never does. Both free, both in your browser.