It is a little WORK but here is what you can do... Remove the TV antenna. Drop the cable down through that hole. Replace the tv antenna calk the heck out of it.. put the XM/S antenna end on top of the TV antenna mast.. using the same calking. NOTE when the power is on to the TV antenna booster the XM/S wont work.. this is sort of what I did...
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12