Just had voom installed 3-8-04 everything went good except i only get one local channel. according to antennaweb site my locals are 36 miles away and i should use a antenna that will work in zones yellow - purple. the installer put up the 3010 stealth antenna... zones yellow- green which the one channel i get is in the green zone...now may ques. can i use my basic cable as my ota. or do i need to upgrade my antenna