I dont quite understand, Your Tv is already capable of getting the local channels, just connect an antenna and make sure its 'aimed' properly. Yolu can use tvfool.com to look up signal inforamtion in your area and which direction they are coming from. If I read your post right, you just might need an antenna rotator.
most hdtv' come with the converter built in them hook up your Arial antenna - you set it up for air - and the channel should scan for the digital signal's - at least all mine do no need for the old converter box on them [like channel 4 analog is 4.1 digital needs to use the . 1 .2 .3 ]
all that should be in your TV's manual
also digital signals are not as strong as the old analog so from the same broadcast antenna you now maybe out of range -- I also lost a few stations I use to get on analog I don't anymore on digital
what tv are you using ?? should show to have - NTSC / ATSC / QAM (Digital Cable Ready] ready to go ??