You can determine if additional height will help by going back to the point where you drag the receive point and enter the antenna height. Every time you make a change, the predictions update. So, test different antenna heights to see what works best for you.
Based on your second repot, no single antenna fixed in place will get everythng you want. The HBU-22 will be perfectly fine for the stations to the souheast. The stations to the northeast require too much antenna gain to hope that aiming between stations will get everything. I'd like to see your final report before making any detailed recommendations.
There should be a way to combine two antennas to get what you want.
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