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Band planning for digital TV systems is very different to analogue. As others have said, a COFDM signal is very much like white noise over the entire channel. Single frequency networks are possible though not always used. There is no particular need to worry about adjacent channels.
If you're using analogue TV RF signals in your system (vintage or otherwise) then try to avoid any local digital channels. They look like white noise to an analogue set and a strong local digital signal can give you a very noisy picture. We suffered this problem at the Vintage Wireless Museum, London, when a new COFDM multiplex started up from the main high power TX at Crystal Palace little more than a mile away. We had to change to a different channel at the museum.
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