I get a kick out of all that advertising stuff. They play on the fact that most people are ignorant to how radio communications work.
The frs/gmrs radios you are all speaking of are UHF. About the worst you can have for trying to talk in the woods. Things like pine needles actually absorb the signals. The lower power allowed by law really keeps the range down. Although power does not set the range. It will have some effect on how loud your signal will be within the range. So what is the range? Well it is line of sight. Line of sight basically is 2xsq rt of the height. Some other variables will come into play as well. Such as curve of the earth, enviorment, obstructions, etc. Frs/gmrs raidos are nothing but toys. Good only for short range talking. Also you do need to buy a license to legally use them. Not many do though.
Some may beg to differ. Yet I will tell you this. I went nuts with them at one time. Breaking the law even further of course. I bought high power true 5 watt motorola commerical handhelds. Rarely could we get better than 1 mile from them if lucky. Then I also had 25 watt mobile radios in the truck and house. Could get about 10 miles out of them. Mobile to mobile. Mobile to handheld could get about 3 miles if lucky. Very few of you will try this costly way of doing it.
So what is the best to use. Well what does law enforcement and such use. FM VHF!!! Now there is only a few ways to legally use this. One is to get your ham license. A cheap 2M radio is around $75 for a handheld, and $150 for a mobile. Next would be to get your own channel from the FCC. Which will cost you about $500 for the channel and then the equipment. There are a few ways to do it against the law, but I will not be an advocate of that!
So what is the range with the VHF. Well the same laws of physics still apply. Since I run a private VHF channel mostly I can tell you this. handheld to handheld. we can get 1-2miles on avg. handheld to mobile(truck) up to 5miles or more but 3 on avg. Truck to truck we can get as much as 50miles at times, but 10-15 is average. Same goes base to truck. Now if you go ham and use the repeaters, well in theory could go cross country I suppose.
Hope this helps someone out there. As I have been through it all myself. From the can and string. to CB, to the GMRS, and VHF. In the coming year we are getting our own channel so no sharing will be needed. Ham is to much of a pain since we may have clients that need to use a radio as well. Although FRS/GMRS is a cheaper way to go. Heck can get watches with it for $20. Great Xmas gift for the kids!!
Steve