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most mobile installs have common mode currents on the coax due to the fact that the groundplane is not optimal.
its just inherent in using a car as a counterpoise.
my guess is that since you now have a long piece of coax going into the garage instead of a short piece that stays within the vehicle, that these common mode currents on the coax are your problem.
the way to get rid of them is to use about 6 inches to a foot of ferrite right at the base of the mobile antenna.
that being said, ferrite on the device that is receiving the interference usually works quite well.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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