Monoprice offers its Monoprice Active Set Top HD4 HDTV 60-Mile Antenna for $9.99 with free shipping. That's the lowest price we could find by $19. It receives HD UHF TV signals, mounts on top of your TV, and features a wideband amplifier.

Also available is the Monoprice Active Curved HD5 HDTV 60-Mile Antenna for $10.99 with free shipping. That's the lowest price we could find by $18. It features the same specifications as the above model, but features a different form factor that isn't made to be TV-mounted.