What is the monthly cost of apple tv

It depends what you buy or rent. There are no subscription costs for just having it.

Plus with podcasts, Youtube and other free content you can watch a lot of TV without ever paying anything above the cost of the Apple TV.

Some information in this article and video "might" be useful in your question

Apple TV

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You can connect to your iTunes acct. Or to your Netflix streaming acct....the one I use almost exclusively. Pic quality is very good.