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ROKU has nothing to do with either OTA or CATV reception.

Lots of discussion about SEIKI TVs and lack of QAM tuners in some models on this forum.

There are basically three different cable systems you may encounter in an RV park:

Ancient (analog): Was the original CATV standard and had cable numbers just like OTA TV at the time - 3, 4, 5, 6, etc. Uses an analog signal. Almost all TVs have the tuner for this CATV.

Digital - The highlight of CATV: uses a digital tuner (QAM Tuner for cable) and tunes in multiple sub-channels with unencrypted signals - 26-1, 26-2, 26-3, etc. Most modern TVs have a QAM tuner and can receive these channels. Some models of Thor provided TVs such as Seiki and Axerra may not include the QAM tuner and can not tune in digital CATV.

Encrypted Digital - The CATV Gotcha: Tired of CATV theft the industry is moving to this format which requires an external tuner or a tuner card from the CATV company that can be inserted in your TV if so equipped. If you have a major cable provider at home you probably have this. If this is the standard the RV park uses you will be required to borrow a tuner box from the office which will tune the channels for you are output the signal either via HDMI (preferred) or old analog channel 3/4 to your TV's cable input.
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