I have a business (ground floor--many tall buildings) with a decent opening for southern exposure. I can't get a signal better than a 1 or 2 bar and of course the signal goes in and out. My sub is up middle of November, and I'm thinking of just cancelling. I listen to the show exclusively on my phone (and anyone who does that knows how shitty the app is with drops and such. Any ideas on improving the signal for an XM radio that actually works?