Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.
The Tv/s , tuners , must scan for the Broadcast Tv Channels sometimes named the 'Air Channels' or 'Antenna Channels' in the , Tv / tuner , setup menu because the Tv transmissions travel through the air from the transmitting antenna to the receiving antenna.
Do Not scan for cable tv channels.