http://www.tss-radio.com/sirius-connect-sirgm1-p-228.html

I just ordered this for my 2006 escalade. I have in dash touch screen navigation, has anyone installed this ? also if you have do i need the single or dual xm-sirius antenna convertor ?

http://www.tss-radio.com/sirius-antenna-adapter-p-3883.html

If it's an '06 it should just be the Single ,earlier models used the dual.