Nice old article. If your installing an antenna system yourself and dont have thousands of dollars to buy a RF spectrum analyzer using the signal to noise ratio meter built into a voom receiver will get the job done just as good and a lot cheaper.
Instructions:
Put voom on the channel you want to tune on the remote control press voom then green then green enter pin if needed select installers menu next select system status use the up and down arrows to find the signal to noise ratio meter. keep using up and down to avoid the display time out.