If you are getting a UHF or VHF rig I assume that either you have a license or are getting one before you Xmit
If you are using a CB in the GRR's then you need to get a whip with a big spring so that you dont lose it under the trees.
Depending on where you are we could maybe meet up and perhaps get the thing sorted. If you drop me a PM I might be able to help.
Oh the other thing is interference but in a disco its less of a challenge not being aluminium and being more of a passenger vehicle.
Maplin's sell all the stuff you need but a bit pricy. suggest take a look at the stuff in Maplins then get it elsewhere.
I find KCB coms and Truck King very good and reasonably priced. One other source is Gumtree or Ad Trader there are always CB's on these sites and if its local you can see before you buy.
Watch out for rigs that have been "doctored" some folks just cant keep their fingers out of the circuit boards
You also might want to try and scrounge an SWR meter from a pal, helps to sort out the problems on the install.
PS Douglas thanks for the promotional punt, as if I dont have enough to do
Tommy