Thread: Can I use a Sat Diplexer to combine sir/xm and FM OTA?

I have a Sirius/XM antenna on my roof. I bring the signal to my den for my AV Receiver.

I get lousy HD Radio reception in the same den, So I bought a great FM antenna. I placed it right next to the Sirius/XM antenna. It works fine, but I have no way to get it in the house without another drill hole.

Since the FM Antenna is only sending 87-108mHz and I think the Sirius/XM uses sat frequencies, can I use an old set of Sat dish diplexers to combine and then seperate the signals?

Is there a mistake in my logic?

Bueller, bueller?