I just purchased my new Prius 2 weeks ago. The dealer wanted $795 for XM. I had XM in the vehicle that I traded in. Xm offer me a SKI Fi 3 for $ 29.00. I tried it today using the AUX port. No static! Very clear signal. I will Install the antenna on the roof this weekend. I presume that the Ground Loop isolator issue was resolved by Toyota, Very easy install. $42.00 including the shipping. It come with a remote too.
How are you planning on mounting the xm radio? Will you post pictures of your finished product? thanks for the info.