l have read that even with Roku, an antenna is still needed in order to get local channels. Is this true?
Not if you're using the Spectrum App and the local channels are part of your package.
A few comments above about "these crappy DTA's" being nothing more than a QUAM tuner". Well, that's all I'm looking for. I have a SONY KV34HS510 TV that was one of the original HDTVs from around 2003 and so I'm reluctant to part with it. Great CRT picture, but no ATSC or QUAM tuner, and it won't get the encrypted channels. It's a TV that is not used for regular viewing, so I'm not interested in a 2-way box that will add $10 to my monthly bill. A $4 digital adapter would be perfect. But I'll acknowledge that I am probably in the minority of people who need this solution.
I want to say that a Spectrum Set-Top-Box is $4.99 per month to rent ($3.99 + $1.00). They were $11.75 under TWC...
An option for your old TV is to get a Roku and use the SpectrumTV app. This is a much better option compared to a DTA, because it will provide you with 100% of the channels you pay for vs just a few using a DTA.
A Roku with the the SpectrumTV app is a decent alternative to paying for a cable box on an old or sledom used TV.
Many current Roku boxes will only do HDMI. I think there is one box that has a composite output. They surely do not support Component Output or RF.
They are a good alternative for a seldomly used TV, provided you are also an internet subscriber.