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Sorry, but the existing cable may or may not work. (Most likely not.)
Cable and Sat TV signals are so strong that installers are not trained to even care about how they install or when or where to split it.
Assuming a single 8 way split, (in my experience it's not, more like several splits in places you can't get to), each outlet will only have 1/8 of the signal you feed to the splitter.
As I said, this is not a problem with Cable and Sat TV, but with OTA it will degrade the strength and quality of the feed greatly.
You will need to use a tone generator to trace out and isolate the cable feeds just to the rooms you will actually have a TV in. Then put in a new broadcast amp splitter to feed just those runs.
Even that is going to have issues. I just finished my daughters house, she had a similar problem. There are 2 rooms that are fed from the same cable in the distro box with a splitter hidden somewhere either in the wall or between floors when the house was built. It gets a degraded signal in both rooms compared to the other 3 runs I tested out.
Getting decent signal where she wanted it took for ever, (days), and several different amp and splitter combinations to get it running.
Worse case scenario is re-wire the house correctly for OTA standards.
The HOA issue is moot, the FCC has prohibited HOA's and even local governments from preventing you from reasonable methods of receiving OTA signals. Your ANT751 is a very reasonable method. (A 10 meter RF telescope on the other hand would not be.) Nothing they can do about it.
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