I haven't turned my CB's on in quite a while..but I'm not going to get rid of them either,in case there is a situation where cell phones and landlines go down..
Often when SHTF the only ones able to communicate with the rest of the world are the ham radio operators..its sad there isn't many of them around like there was years ago..
The 40 channel SSB base station I have ,would be able to talk to others on SSB up to 40+ miles away in good conditions pretty consistently..all I had was an Antron 99 antenna then,which has since been destroyed by several Nor'easters...
I put a Shakespear 9 foot fiberglass whip on the 30 foot mast after that,just so I could still use it,and overall,it works almost as good as the Antron 99 did..
I have a Turner 3+3 power mike and though I do have a Pyramid 100 watt linear,I don't use it,it just over modulates so bad no one could understand what I was saying..
It has upper & lower channels too,someone modified it before I owned it,and I have talked to a friend years ago when he was in NC every morning when the skip was coming in,he had a Ranger radio with SSB and FM,that had no amp or "peaking" done to it...we used channel 38 upper sideband..
When skip was "in" during high sunspot activity years ago,I was able to make contact with many far off places,including Barbados Islands!..
I do not have a frequency counter,so I do not know just what frequencies it gets with the modifications done to it--but those channels were the ones that had the most skip shooters on SSB ..
AM doesn't have much range on a CB,maybe 10 miles if your terrain is pretty level,more if its on a mountain top or a boat on open water,then you may get up to 50 miles..SSB goes quite a bit further..
I probably have a dozen "mobile" AM only CB's of various makes and some are very old 23 channel ones,and a few that only had 3 or 5 channels that used crystals,collecting dust in my garage..
The old 23 channel ones were often more powerful than the later 40 channel ones..
Years ago the CB airwaves were so crowded you couldn't get a word in edgewise,even on SSB here...now its pretty much silent on all channels,a few die hards are still out there with Galaxy base stations with SSB and FM,and power mikes,linear amps...some were so into the hobby they had a "shack" in the back yard for all their radios and put up telephone poles to mount big "Moonraker" antennas on with a rotator..
Now a CB is actually useful again seeing there is no "traffic" to speak of on those bands now..but cell phones and 144 mghz ham radios have pretty much made them obsolete..till the day comes when they are needed again..