I have a XM in my Baron and it is indispensable for long trips. The car
mount antenna sits on the glare shield along with the receiver. The output
plugs into the audio jack of my PS audio panel.

The only problem is that I get a lot of high pitched audio noise when the
plug is plugged in, even with the radio turned off. I suspect the cheapo
12-6 volt converter in the plug generates enough noise to get picked up.

It really gets annoying after a while, especially since I had a 24-12 volt
converter hard wired into the plane to convert all of the lighter sockets to
12 volts just so I could use the satellite radio. Any suggestions in this
regard would be appreciated.

The reception is excellent (no drop outs like in a car when going under
trees or an underpass). The PS audio panel automatically mutes the radio
when ATC or someone talks on the intercom, which is OK, but could be
annoying to some.

With 110 channels there has to be something to listen to for everyone, and
except for the electrical noise I think it is great.