2013 Sonata - Aftermarket Nav radio and XM tuner with factory sharkfin antenna?
 

The title probably says it all but I own a 2013 Hyundai Sonata and I am about to order the following stereo components:

Pioneer AVIC-8200NEX
SiriusXM SXV300V1 Tuner

In the interest of cleanliness, I would rather not install 2 separate antennas, one for gps and one for satellite, when the vehicle comes from the factory with a GPS/XM antenna right there on the roof.

My question is, has anyone figured out a way to use the factory antenna with an aftermarket radio and aftermarket xm tuner?

If so, what did you do to make it work?