If you have feed line radiation with both a balun and cable isolator
(coax isolator) in place you may have a faulty balun or isolator, or
have them installed at a critical length for the band where you observe
the feedback.
The most common feedline radiation problems I have seen have been Field
Day stations, and a squeal in the rig audio, if you monitor its transmitter.
RF in the shack shows up as a shock or burn you get off a metal cabinet.
I doubt you have either one, if you don't know what to look for.
Extreme high power cases are shockingly apparent! ;-)
Stuart
K5KVH
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