The FCC web site is showing that only digital channel 5 is transmitting , and not , 21 , 28 or 29 ,
http://transition.fcc.gov/fcc-bin/tvq?list=0&facid=2455. The antennas you have suggested do not receive the low band tv channels. Install a All Channel antenna that receives VHF Low channels 2 thru 6 , VHF High channels 7 thru 13 and UHF channels 14 thru 69. Install a Winegard HD7082P antenna aimed at about 35 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html. Here are some Strong and Sturdy antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html