It looks like your channels are a fair distance away (about 46 miles) and slightly blocked by some hills. Here's a cross-sectional view of KSPR to give you an idea of what the terrain looks like between the transmitter and your home:
The good news is that there's still enough signal reaching you (for the top five stations in your list) to be captured by a good antenna and they are all coming from the same direction.
I'd recommend using a Winegard HD7698P on your roof, pointed west, and a pre-amp. Some good pre-amp choices would be the Winegard AP-8700, Antennacraft 10G202, or Channel Master 7777. Use RG6 coax to connect everything together.
