@Catgurl assuming your answers for @DBDukes is that this is a Roku TV, the answer is no, there's no way to manually add a channel.
One thing I will mention is that many TV stations have changed the actual RF frequency that they use recently, and that might be the cause of your issue. For example, here in the Seattle area the four major networks (ABC, NBC, CBS and Fox) were all originally on VHF channels (13 and below). When digital TV became the standard, they have all moved to a UHF channel number, even though they still call themselves "King-5" or "KIRO-7". If your OTA antenna is not optimized for both VHF and UHF bands, you simply might not be able to get your local channels with the antenna you have.
Since Digital TV became the standard, there has been at least two separate times that the actual RF channel was changed by local stations. This was because the FCC (which controls and licenses TV station channel assignments) required stations to make the changes. The best way to determine exactly what channels you should be able to receive, and what sort of antenna is required, is to enter your home address in Antenna Web. It also tells you the direction each station is from your home, to assist pointing your antenna. It tells me that I have the potential of 97 different channels from 27 OTA stations. In reality I get about 62 of the total listed, with terrain blocking the others. I have a medium sized yagi antenna hanging inside my garage ceiling, which places it 15' off the ground and my home is 300+' off the valley floor, looking north.
With digital TV, you must have a minimum signal strength to receive a watchable broadcast. Back in the analog days, a weak signal would often be watchable, albeit with "snow" and other artifacts. But digital is like a cliff: you either have a good image or nothing at all. When you're right at the edge of the cliff, you get a picture, but often pixelated and unwatchable. Some antennas can be improved with an in-line amplifier placed close to the antenna itself. If you have splitters feeding the signal to multiple TVs, remember that each splitter is reducing the signal by roughly 3.5dB. How much of a loss is that? Well, a 3 dB increase in signal takes almost double the RF power. In audio, 3 dB is a barely noticeable increase in volume, but again takes double the power. More than one signal splitter in the line, and you've dropped your signal by 50% or more, and you can have problems receiving even the stronger stations.
Dan
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