For reception of the Baltimore area Tv stations/channels install a Winegard HD7084P antenna with a Winegard AP8700 preamp aimed at about 260 degree magnetic compass.
These will be 2 Separate antenna systems and will not be connected together on to one coax.
The 2 Separate antenna systems coaxes will go to the Tv location and connect to a remote control A/B antenna switch and the output of the A/B switch will connect to the Tv.
http://www.radioshack.com , # 15-1968 , or ,
http://www.mcmelectronics.com , # 32-4425.
As always the starting aim direction of a antenna is the --> Starting aim direction. The antenna is then turned to the left and right to find the one direction that provides the best reception.
Very often that one best direction is the starting aim direction.