Motorcycle Satellite Radio What Can You Use To Keep Your Satellite Radio From Cutting Out So Much?

What can you use to keep your satellite radio from cutting out so much? - motorcycle satellite radio

My father has bought a friend said something XM radio with your bike, unfortunately, no cuts and if the units under a tree or a bridge, so he bought at Radio Shack, but when I was low there, they were no longer sell. I must really know what it is, because that's what you want for Father's Day and the people who save impossible. HELP