Please use this method for an accurate plot, it may (or may not) generate a different forecast.
http://forum.tvfool.com/showthread.php?t=14508 Be sure to manually enter your proposed mounting height.
HOAs, in general, are prohibited by federal law from enforcing such blanket prohibitions in most situations. See
https://www.fcc.gov/guides/over-air-...n-devices-rule
Whether or not that existing mount will serve as a mount for an OTA antenna depends on several things including its specific location on your home as compared to where an OTA antenna NEEDS to be. If it works, great. If not, something has to move. Existing coaxial cable, if otherwise unused, may be re-purposed for antenna signals, the cable is 100% compatible. However, there may be certain satellite-specific devices that will need to be removed or replaced by a device that works properly with antenna signals.
You will probably benefit from an appropriate preamp or distribution amp, that's yet to be determined. If you want to go for signals in a direction other than Tampa, you'll probably need a rotor which will open up a whole new can of worms.
Line of sight is critical when dealing with UHF signals. Placing the antenna in a spot that causes it to be aimed point blank into your roof, your neighbor's house, a big tree, or a forest will usually mean compromised reception. The desired antenna mounting location is the one that offers the clearest signal path so the signals can get to the antenna with the least obstruction.