Alabama

https://www.rabbitears.info/
Especially
https://www.rabbitears.info/searchmap.php
Especially
https://www.rabbitears.info/s/2394854

The three closest stations, WFIQ, WGDF, and W20DF-D, are rated good, fair, and poor. All the others, some 30 to 70 miles away, are rated bad.

External tuners are uncommon. The only places you'll find CECBs anymore are yard sales and thrift stores, inevitably missing the remote.

I believe one of the conditions of CECBs was that they put out only a modulated signal (type F connector} and a composite signal (red, white, and yellow RCA connectors). The Channel Master external tuner had an additional higher resolution output, so it was not eligible for the coupon, if I'm not mistaken.

The Zenith DT901 was highly regarded at the time. It was also marketed by Best Buy as its Insignia model. I really like the one Radio Shack sold, the Digital Stream. The onscreen menus have big type, and it is exceptionally user-friendly.

The thing I really like about the Zenith and the Digital Stream is that when you scan for new signals, you do not erase the channels you have already stored. By contrast, for one example, the Apex CECB throws away the channels you have stored and starts all over again. The tuner in my Samsung flatscreen TV also does that. Some TVs keep the existing channels and add new ones that you find.