Sure they all record OTA signals, I’m not the first to suggest they not all comparable equally, here’s tablo’s blog post… Tablo OTA DVR vs. Amazon Fire TV Recast Comparison – What Cord Cutters Need to Know | Over The Air (OTA) DVR | Tablo, Forum topic, Tablo vs Recast and an excerpt post Tablo vs Recast - #13 by tapokata and this doesn’t even include the “lesser” converter styles still on the market.
Not one may be right for everyone, but the vast differences make it likely everyone can find the right one… maybe.