I am a belt and suspenders guy. So, I have CB, 2m, 70cm, and 6m.
CB (11m wavelength) is super common but it is AM (amplitude modulation) resulting in poor quality audio, only 4W legally limiting range, and you often get interference from illegal high power stations or did to skip. The latter occurs on lower frequency (higher wavelength) radio interacting with the ionosphere at night (you can look up more details) and allows for (unreliable) long distance communication.
My hunting buddies insist on FRS/GMRS which is portable and good for a couple miles. I don't know if it is FM or AM but probably the latter because audio quality isn't great. There are lots of channels plus codes to further filter out busy airwaves (they aren't a security feature though). My biggest beefs with them is that I have tried many radios and few seem to be capable of the advertised range. Also the radios I have used all seem to cut off the first part of whatever I say. Maybe they have a delay in transmitting after you press the PTT. I can't count the number of times we have had to retransmit to be able to understand each other.
2m is super common among amateur radio operators. The voice bands are frequency modulation. Many more frequencies exist. Power for handheld is usually 5W with low power modes and around 40-50W for mobile installations meaning the range is quite good. The audio is usually crystal clear, and there is rarely any issue with intelligibility. By far the greatest advantage? Repeaters! In Colorado, a large number of repeaters are linked, called the Colorado Connection. I can be at home and talk to someone in Durango, for example. There are Hams that are part of emergency communications groups and volunteer in diaasters-- like the floods we had in CO awhile back.
70cm and 6m have all the same advantages. They are less popular. 6m least of all. But 6m has both repeaters and long enough wavelength to skip.
The lower frequencies are less affected by stuff in the way (trees etc) while higher frequencies are more sensitive and like less obstructed line of sight.
You need an higher level test to get a license for 10m and up bands but these are the go-to for long distance (DX) communication. And with FM, SSB, and Morse code, you can really reach far. But I don't think it'd be super helpful to talk to some random guy in Ohio while you are stuck freezing on a mountain in your dead Jeep
CB is used widely by wheelers but I would love to see more hams and their radios on the trail because they provide more reliable, clearer voice communication and much wider range in an emergency (cell coverage isn't 100%... yet...).
It's not like the test is that hard. The FCC gives you the questions and answers ahead of time and it is multiple choice.
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