GSM trail cams?

I bought a pair of Motorola FRS radios a few years back and they seem to work well, but range does diminish quite a bit when upland hunting in PA. My first thought was that CB might be better, but then I realized that I probably don't know what I'm talking about, so I did a quick search. Found this:

http://radiofreeq.wordpress.com/2013...-gmrs-vs-murs/

Plenty of graphs and whatnot, but this seems to be closest to the situation you'd be describing:


Higher wattage looks to be better, but in open, flat terrain, you could probably get away with FRS radios for relatively cheap, with the understanding that they'd be just about useless in high country. The right tool for the job, I guess.

Vehicle-based radios seem to perform better because of larger antennas.