It might work but finding the right equipment to combine and separate signals could be an issue. XM and Sirius use frequencies between 2300 and 2400 MHz. That's right at the top end of the DishPro IF spectrum. Expect interference if DishPro or DPP equipment is being used. Legacy equipment might work. You may also run into problems with power on the coax. Not sure if Sirius and XM antennas require power but I suspect they do. Dish/Bell equipment definitely requires power to operate. If possible, recommend running separate cables.