It's a 1-time cost for the Antenna's & Decoder Box.
After that, you get indefinite free OTA Digital Broadcasts of shows.
The ads are no different than current day BroadCast TV ads.
If they can't stand those, than I don't know what to say; do they pay for NetFlix tier w/o ads and only rely on those?
Cause all the content is split amongst all the various streaming services.
There's no (1-stop shop).
And I think if we're honest, short of a real Universal IPTV Digital Store where every TV Show/Series/Movie is A-La-Carte and nothing is free w/o Ads & you pay on a specific content piece or pay for a series, then there is no practical way to avoid ads.
I know that WWE Live Streaming RAW, even with the Ad-Free tier of Netflix, will serve you ads.
So some Ads are un-avoidable.