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You should probably re-run your report for 35 ft and see what kind of gain you would get for the additional 10 ft. but generally the higher, the better.
Barring no trees or building close in on 290 degrees, you should be able to get those stations with a couple of high gain antennas:
Antennas Direct DB8e or XG91 for UHF
Antennacraft Y10713 for VHF
Someone else may want to weigh in on one of the combo VHF/UHF antennas that may work
One of the Rohn self supporting towers would probably do a good job for you--either the BX series, or since you are in a windy area the heavy duty HDBX series.
If you are only interested in the OKC stations, you won't need a rotator which just adds another level of complexity (especially when you are in a high wind area)
If you are getting enough signal your might not need a preamp. Also depends on how long a coax feed you would have from the antenna to the point where you split to the other TVs. If you don't need a preamp you could split the signal to 4 sets with a Channel Master 4 port distribution amplifier. If you do have to use a preamp, then you may have enough signal for a 4 port splitter.
As far as a DVR, I really like the Channel Master DVR+. If your older TV has an HDMI port, it will connect directly to the TV. The DVR+ has two tuners built in so you can watch one show while recording another or record two shows at once. If your TV set does not have an HDMI input, you can purchase purchase converters to change HDMI to other formats. If you have an Internet connection, the DVR+ automatically downloads a program guide very similar to what you had with Dish.
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