I have owned a
Zenith DTT901 for several years.
It tends to be capable of tuning and locking on signals that other tuners have a bit more difficulty with.
The electronic program guide (EPG) is full featured, better than that of the more expensive flat screen HD TVs elsewhere in the house.
The DTT901 will accept direct manual channel input. Channels can be 'learned' by automated scan or added and deleted manually.
The unit remembers screen format settings for each channel. A feature not seen an all DTV converters and TVs.
I was able to use a government provided coupon when I purchased the unit which made my cost less than $15 as I recall. Sadly, over the last several months, the price has steadily climbed to a point that makes this converter very difficult to recommend.
DTT901 at Amazon I would willing pay more for the DTT-901 than similar products, but not 4 or 5 times more.
I have the product manual in PDF format but it is too large to attach to this thread.