Only had the XM sat radio tuner for about 2 years and I'm starting to have problems with no signal showing up on my tuner. I'm pretty sure it's the antenna.

Have u guys had to replace the XM antenna on these GEX-920 tuners soon?

As an installer I see MANY customers come in needing a new antenna in roughly a (1) years time. 2 years is not bad at all. $30, replace it.