Walmart offers the Browning Satellite Radio Trucker Mirror-Mount Antenna, model no. BR-TRUCKER, for $29.98. (Amazon has it for the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $5.97 shipping charge. That's the lowest total price we could find by $6. It's compatible with Sirius and XM systems, 3-way stainless steel mirror mount and bolts, and measures 10" tall.