Originally Posted by Snarky
This is true, I've tested it and it does seem to affect the signal a bit. But it's not that bad, it drops the XM signal by about a bar.
When I had my Versys I mounted the GXM 40 on the the passenger grab handle on a techmount on my alu-rack and ran the USB cable to the rear.
On my GS and threw caution to the wind and mounted the antenna to the GPS mount using a bracket.
I'm still fine tuning the adjustment of both the bracket and the mount, but I would like to think that the steel bracket the GXM40 is screwed into, helps shield the XM signal from interference from the Zumo 665 itself. It blocks the bottom of the entire antenna with a steel plate directly between it and the Garmin.
Your Zumo battery is low...better charge it soon.