So are you saying that the Tv stations are or are not in the direction of the 20 foot hill at 233 magnetic compass?? I suggest putting the antenna on the balcony not under the balcony that is above you. You need all the height you can get. Use a tripod mount to STAND on the floor of the balcony with the antenna mounted on a pipe that is in the tripod mount. Have the pipe as long as possible to get the antenna up as high as possible. Channel Master tripod mount CM 3092. . Here is the Federal Law that says yes you can install and use a antenna on or in the balcony ,
http://www.fcc.gov/mb/facts/otard.html , this Federal Law has been in effect for 15 years.