I'll be doing 100% coax I have a Surecom SW 102and Surecom SW 33 mark II. to check SWR and power. I was certainly disappointed to learn all my CB test equipment SWR/Power wouldn't work on GMRS. I do have dedicated GMRS antennas but they look just like the ones that come with the little CBs that are on the market. Fit in the palm of your hand, some dead key around 6 Watts and swing 10-15Watts I run a President Bill in my Ford Ranger but have it on a 5 Ft firestick, SWR is 1.5/1 to 2.1/1 from 25.615 to 29.205. If I'm on a longer trip I'll put in a RM AM/SSB KL23P 100W linear. On a good day it will talk across the grass median.
Ran a Midland MXT500 for awhile, with the included antenna, I was not at all impressed. Nobody out there. Of course alot of places I go there is NO cell service, NO FM radio, and AM is the boarder blaster Mexican stations.
So, I was thinking of running the Midland as a base station, and as long as I have the pole down put up a good CB Base as well. That's another story on a different forum..
Guess I'll go looking for an antenna analyzer. And see if I can figure out how to use it.
Rules can be broken, Laws cannot (should not). So don't lecture me on power and frequencies, I know the rules.