Digital adapter vs. Roku - Time Warner TV

This question is about "Digital adapter vs. Roku", with Time Warner Cable TV and apps. I have a bedroom tv, 6yrs. old that only has a coaxial cable hooked to it. I can only get basic stations on it and none in HD. A digital adapter will solve my problem but I refuse to pay $3+ a month more. Can purchase a Roku streaming stick and get HD stations free with it.

This topic covered Digital adapter vs. Roku, and TWC cable tv service.