Which Antennacraft model are you using presently?

You will likely need a preamp in this situation. But, yes first try some additional height to see if that solves the problem.

Antennacraft HBU-33

The location may also be the problem. I had to try three different locations on my roof before I could find the best spot that gave me good reception of all my local signals. HDTV signals are pretty finicky.

Unfortunately, the roof is not an option. I am the one messing around with this stuff for the most part. So we have the antenna on a 3/4 inch conduit pipe running up the side of the shed. So far, we have it at approx. 10 ft. I know this is part of the issue, but I can't climb around on the roof! This is what I have "bookmarked" to buy when I get the money:
1. WINEGARD HDP-269
Low Noise, High Input UHF/VHF Pre-Amp!
2. Round 3 Wire Rotor Cable
3. Model TDP-2 Antennacraft Heavy-Duty Antenna Rotator

Good rotor. I own one and like it. It will easily handle much larger antennas if needed. I have an HBU 55 on it and it works great.

The pre amp you've chosen is usually the one people recommend for stronger signal areas. So, this should work especially if you get the antenna up a little higher. At ten feet you have too many obstacles in the way of the signal to the antenna.

Did you ever try connecting the antenna directly to 1 TV with no splits? This is a good place to start before adding any amplification.