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Honestly?  I'd use a short piece of coax to set the antenna using my MFJ-259b.  After that I'd cut the coax the lenght that I needed to reach between the radio, boxes and antenna and call it a day. 


Unless you want to go and add filtering and feedback circuits to the amp/amps in question, then that's a different thread.


HERE Here is what you are trying to do.  You are trying to find a low voltage area to place your meter, when nothing else in the system has changed.