Radio range
I am not sure (can't point to the exact words) but think that the power output on the 72 and 75 MHZ bands is limited by law to 1 watt input to the final. If you try to use a power amplifier, you will be in violation of the law in the USA. Again, I am not sure, but believe you can get an HAM license and use a lot more power but you should check out the rules for sure before trying. There are probably other criteria governing such applications that you propose as well.