What I did was first scan the TV band for ATSC carriers (the Zenith DTT901 has a manual tuning that lets you scan based on RF channel instead of the make believe virtual channel number, or if you prefer you can usean online station locator) and make a list of all RF channels with measurable carriers present and avoid transmitting on those stations (attempting out shouting a commercial station isn't a good idea)... Adjacent channels may or may not work well so if avoiding them is easy it might be a good first move. Also there's now ATSC 3.0 in some places so you may want to find and avoid those.
Then I follow this video.
https://m.youtube.com/watch?v=z4dhRt7tmd4 my college antenna elective taught me that you don't need a fancy meter for performing the antenna matching. The formula used to calculate the antenna is meant for a 50ohm system (Ham radio and test equipment) not a 75 ohm system and basically the percentage of length you need to remove to tune a dipole of a frequency from 50 ohms to 75 ohms applies to a dipole of any frequency. So I just calculate the percentage of length shango removed then remove the same percentage from my antenna.