I took the XM out of the RSX and set about installing it in the tC. The first problem was attaching the antenna to the car. It is held on by a strong magnet...which doesn't work on glass. After looking the car over, I decided to put it up there anyway. I placed it a few inches in front of the hatch and taped it down with electrical tape. I used tape on the RSX and weather didn't affect it much and it didn't harm the finish.
I ran the wires through the hatch area and under the seats. I have pictures if anyone wants to see them.
I set the tuner under the drivers seat and ran wires through the console.
Finally, I set a piece of metal at the top of the storage bin and velcroed the remote to it. I ran all the cables through this area (including radar detector) so the area is cable free.
I have additional pic of the install if anybody want to see them. XM works fine.

I ran the wires through the hatch area and under the seats. I have pictures if anyone wants to see them.
I set the tuner under the drivers seat and ran wires through the console.

Finally, I set a piece of metal at the top of the storage bin and velcroed the remote to it. I ran all the cables through this area (including radar detector) so the area is cable free.

I have additional pic of the install if anybody want to see them. XM works fine.