I don't currntly have HD but will eventually upgrade but for now I am happy with my SAT-A4. In the meantime a friend gave me an old AU9 slimline dish and when i tried to install i could only pick up an intermittent signal. I am 95% sure I have it pointed correctly and my signal strength will jump up to 97 but then nothing. Basically I have great signal about every 7 seconds. Is this dish compatible with my system or do i need to get a multswitch or something? Any thoughts?