Your location appears to be outside the typical distance needed to receive reliable OTA TV through a TV antenna. While this may still be possible under optimal circumstances, streaming is also a viable option if you have broadband internet.

Here is the list of channels you can expect to receive:

TV StationNetworkChannelLocationStreaming
KRTVCBS3GREAT FALLS, MT
KFBB-TVABC5GREAT FALLS, MT
KJJC-TVINDEPENDENT16GREAT FALLS, MT

TV Antenna Comparison Guide

Different TV antennas for different situations