For approximately two months (since about Christmas 2015) my XM signal fades in and out (0 bars) for long periods of time. Other times the signal strength is 2 solid bars. This occurs on two home units. Prior to this, the signal was always good (2-3 bars). Antennas are in good positions with clear view (of the satellite). Signal in the car is solid 100% of the time. Calls to XM have proven fruitless. I am in the Dallas-Fort Worth area. Would the larger amplified antenna (as seen advertised) rectify the problem? Can I feed two receivers off this antenna? Any other suggestions? Thanks in advance.