Antenna Selection Guide
To find the perfect antenna, first list the RF Channels around Omaha or Sioux Falls which you want to watch.
http://www.hdtvmagazine.com/programming/broadcast.php
information
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 can use an indoor antenna. They work just fine with older TVs using a converter box, and with all new TVs. You'll need an outdoor antenna if you're more than 15 miles from transmission towers, but most towers are located very near town and are powerful enough to reach you.
EXAMPLE...
We'll use a site near Tampa, Florida Select AntennaWeb.org then ENTER:
11565 66th Ave, Seminole FL 33772
A Map appears, press Continue. Next a Channel List appears, press "Show Digital Stations Only," and this list appears. The strongest stations are at the top. Record the RF channels, with colors, you like. You'll need both for the Antenna Charts.

Cross-checking this List with Tampa's RF Channel List reveals a shortage of stations here, and WTSP is not on RF Channel 10, etc. If you have any doubts check with TVFool.com for another List, as below.

What's important is for you to get-a-feel for where desirable stations are located and how far away they are. Since the stations in our example are greater than 15 miles away, we'll need an outdoor antenna. Only two of our RF channels are VHF (numbered less than 14).
Press "View Street Level Map" on your AntennaWeb Example Page to see the map at right. We'll need to aim our antenna(s) in those directions to receive the channels listed. A rotor could be used to receive both RF Channel 24, CBS in St. Petersburg, and all of the other RF Channels using one antenna.
The Color Code associated with each station is used to determine which antenna type we should use to receive it.
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