TG is correct as to the design of the 91XG. It's not intended for VHF reception. However, since you have a rotor, try positioning the antenna so that it's aimed broadside to the direction of your VHF station. I've observed several times that this will allow some measure of reception of VHF with the 91XG.
The Myrtle Beach area has a good chance of having FM interference into VHF-13. You might find that adding an inexpensive FM trap will fix your reception. Radio Shack carries one under their catalog # 15-0024.
I'd try tho experiments above, separately and in combination, first. Then, if necessary, add the high-VHF antenna as TG suggested with should assuredly remedy your reception situation.
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