I am on my second Sportster and it is having the same problem as the first one that I had replaced. It will work great for a few days and then suddenly exhibit a no signal x instead of three bars. I know that the antenna is mounted properly because it will work. I will call Sirius and they will walk me through some sort of "cycle" or something and it will work again. I am tired of calling them. Is the Sportster a lemon and should I purchase a different model of satellite radio receiver? I really like the Sirius programming.