[gkey]

Thanks Pete, I was thinking about that too - should have said that in my initial post. I am saving up for changing out my centre panel to Garmin 530W, SL30, new audio panel etc, and that is when the new Garmin antenna(s) will be installed on the roof.

I thought of keeping the 396 as a mobile unit (as I have a few planes) so that I can swap it to whichever plane I fly.

So this brings up an interesting question (to me): If I install an antenna on the roof, can I install it so that I can use it on the 396 initially, and then later on use it for the 530?

Did you also mention that the Wx antenna can be mounted on the roof (i.e. outside)?