You might want to watch this 8-minute video from the Consumer Electronics Association
Tampa Bay's New RF Channels
Station Channel RF Channel Network
To find the perfect antenna, first list the RF Channels in the closest large city which you want to watch. The CEA, Consumer Electronics Association, and NAB, National Association of Broadcasters, created the AntennaWeb to help you with the rest. Free! An example of how it works is presented below.
NOTE that all TV stations are transmitting on different channels now. To avoid confusion, however, the new tuners and converter boxes allow a station to keep its old channel number while automatically switching you to its new RF Channel. Some of the new RF Channels are VHF but most are UHF.
RF Channels on your list numbered less than 14 are VHF. They need a broader antenna than UHF channels; the ones numbered 14 and up. Since HDTV is 91% UHF, you probably won't need to use a broad antenna.
Most need an Indoor Antenna. They work just fine with older TVs using a converter box, and with all new TVs. You'll need to use an Outdoor Antenna if you're more than 15 miles from stations' towers, but most towers are clustered near town and are very powerful.
We'll use a site near Tampa, Florida
Press AntennaWeb.org, then Press
"Click Here to Start," then Enter the
ZIP Code 33772 and Press "Submit"
A Station Tower Map will appear beside a list, as shown below. The strongest stations are at the top. Record the RF channels, and Antenna Color Codes, of the stations you want to watch. You'll need that information to select the proper Antenna.
To verify this Map and List, select TVFool.com using the same Zip Code, to get the following.
Color Codes represent an antenna's reception strength. Within 15 miles of stations an Indoor Antenna can be used (in the Yellow, Green and Light Green Zones). Farther away you'll need to use an Outdoor Antenna. Our Example calls for Color Codes blue and violet. The stronger violet type will work for both. Since four of our desirable stations' RF channels are VHF (all but ABC are less than 14), we'll need a broad UHF/VHF antenna.
WE STRONGLY RECOMMEND THAT YOU HIRE A PROFESSIONAL
FOR ALL ANTENNA WORK OUTSIDE YOUR HOME.
THIS DATA IS PROVIDED TO KEEP THEM HONEST!
One Large Directional UHF/VHF Antenna pointed about 92°
Having gone thru this Example - ENTER YOUR Complete Address or ZIP Code