OK... so here is my solution. It is kind of a kludge, but it gets the job done.

I installed an aux input yesterday. I will run a 3.5mm cable from the headphone jack on my myfi to the aux input. In the glove box I will install the power adapter that plugs into the flashlight charging port and run the xm antenna into the glove box. By installing the aux port in the glove box too, I can keep the entire myfi in there and use the remote control that came with it to control it.

Like I said, not the most elegant solution but it should work ok. My cost was $39.95 for the aux, $4.99 for the dual 3.5mm cable and $8.99 for the power adapter.

Now... how do I get rid of the hum that I am hearing via the aux input?