Check the antenna connectors. My Archer had a loop antenna mounted on the
belly and a sense antenna mounted from cabin top to the vertical stabilizer.
When I unscrewed and removed the loop antenna I found quite a bit of
contact corrosion. The female side of the plug was a mini tube socket that
I was able to buy at a local electronics store.

I eventually pulled out the ADF and installed an Air Gizmo panel mount for
my 496.

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Best Regards,
Mike

http://photoshow.comcast.net/mikenoel