I have seen posts from people that say they have the antenna mounted on the dash with no reception problems. However, according to this link, SiriusXM does not recommend that.
https://shop.siriusxm.com/edealinv/servlet/ExecMacro?nurl=control/CategorySupport.vm&ctl_nbr=10600&catParentID=58751
I purchased an adapter cable (VAIS Technology SFA12F) so I could use the existing antenna on the roof of my 2012 Toyota Rav4 with the SiriusXM SXV300 Connect Vehicle Tuner and my 8100NEX. I loose reception when I pull into my garage, go into parking garages and a few other locations, wh