Pre-program your radio with local repeaters to the area and test BEFORE going out!
Know your Simplex Frequencies and have them programmed as well. i.e 146.520.
Some secondary frequencies are: 52.525, 223.5, 446.0 and 1294.5 MHz.
Consider having an FRS or GMRS radio on hand and set to channel 3.
Wilderness Protocol recommends that those stations able to do so should monitor the primary (and secondary, if possible) frequency every three hours starting at 7 AM, to 7 PM local time, for 5 minutes starting at the top of every hour.
Have an alternate antenna that can be elevated to improve chances of making a contact and getting help.
If you have a phone, consider re-recording your voicemail greeting with information on your location and status if you were not able to reach anyone by calling.
If for some reason you have an HF radio, get on the bands and call CQ to get help. Someone somewhere will be able to call authorities an send them to your location to help you.