The XM Antenna plugs into a socket attached to the Frame forward of and behind the left Mirror pod,
accessible by removing the painted panel surrounding the left Indicator.
From there the harness runs into the Audio Unit housing below the under seat storage compartment,
where it plugs directly into the top of the Audio Unit - so check those connections in case they have been disturbed.
It "sounds" though like there is a breakdown of an electronic component after being used for a few minutes
and this may be within the main Audio Unit - RadioSound inc ( details provided in previous message from
trophied )
will be able to advise on possible repair options.
Should you need to replace the XM Antenna, ( Part Number T2505856 )
it would appear that they are no longer available.
When I checked this morning - Hermy's Triumph eStore was off line

There is currently a "used" XM Antenna being offered for sale at an inflated price on eBay,
( GBP 136.18 ) although they do have the "Make an Offer" feature available,
and would appear to provide "free" US Shipping :
13 Triumph Trophy 1200 SE Radio Antenna( The last listed price of these at World of Triumph before they became unavailable was GBP £87.02 )
