TV Fool uses the data provided by the FCC. Stations must have a license for each transmitter. In the case of their primary transmitter, the call sign is recognizable because it's used in the stations branding and station ID's required by FCC rules. Some stations operate one or more 'translators', often to improve coverage in areas blocked by terrain. The license may bear a call sign that is a near duplicate of the primary transmitter, but often the call sign issued by the FCC is in a form such as you see listed on your TVFR. Given a unique call sign, TV fool and others are able to specify each transmitter in the data base without ambiguity. Thanks to Trip Ericson for the wonderful resource of rabbitears.info.
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I know that a lot of people here are quite negative of the ANT751R.
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I have not observed that, in fact I have seen the ANT-751R recommended frequently when it's an appropriate option. If you already have one, try it. If you find that the signal strength is too low to provide reliable reception I would suggest you use an 8-bay panel antenna such as the DB8e or CM-4228. Even though you're quite close, the transmitted power is very low... You may find that a high gain antenna is needed. But again, try what you already have first.