while for some if they are close enough to transmitters, the amplified flat antennas will work fine. Unfortunately most indoor antennas are built for style, not performance. The wavelengths of uhf and vhf waves are different, so most indoor antennas do great with the uhf but not vhf. I used that website and picked up an outdoor antenna that I mounted to the post where my DirecTV dish was, aimed to the compass bearing the website gave me, and plugged it into the cable feed that ran into the house. Now all my tvs in the house plug into the wall just as they would with cable/sat. and I get around 40-45 channels crystal clear, including Telemundo (but I did delete it out of the tuner because I don't speak spanish).