[Carl n Susan]

I have no idea. But for 7 bucks it is worth a try. SWM uses a wide band of signal (small MHz to 2 or 3 Ghz) so that may be a limiting factor. The "Guide for Using DIRECTV® SWM Technology
with Winegard® Mobile Satellite TV Antennas" PDF shows the use of an A/B switch when you have two sat antennas (portable dome and SL3) so I think it will work. That means you probably have to go out to the convenience center to switch inputs. That also kills the network connection to the mini-Genie. But it should solve the single coax issue.