Our sets with tuners built-in find more watchable channels than the IView. We have an IView, quirky firmware, replaced a bad capacitor after a year of 24/7 use, but ok for the money.

IView 3500 STBII, or Mediasonic Homeworkx 180PVR

Both of the ones recommended are at Wal-Mart and Amazon. About $38. 

Bought an antenna before even checking to see if the TV had a coax input, it didn't. Looked into it and found external tuners were the way forward. Any suggestions on which are best for a relatively low price or other ways we could watch in market NFL games *legally* while avoiding Sunday Ticket and the like? Any advice is appreciated. Thank you.

Best external tuners?