I recommend a Antennacraft U8000 aimed at 245 degree magnetic compass. The U8000 has extended reception ability in to the VHF high channels. The U8000 will receive WUND-DT 20 PBS through the back side of the antenna. Also install a Channel Master CM 3414 four way distribution amplifier. I strongly recommend not using all those splitters , splitters reduce the signal strength each time a split takes place. I suggest having a single run of coax from each output of the 4 way distribution amp. And have one 2 way split for the Dish DVR and Vizio Tv. Here are places to buy Tv antennas and etc. ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com ,
http://www.3starinc.com