WPVI-DT channel 6 ABC is transmitting on channel 6.
Of the listed antennas the HD7000R antenna has the longer metal reception elements at the back of the antenna for the best reception of channel 6.
The other antennas listed will receive channel 6 but not as well as the HD7000R.
Here is the Federal Antenna Law that says Yes you can put a antenna on a patio or balcony.
http://www.fcc.gov/guides/over-air-r...n-devices-rule. .
Also many apartment buildings have the small dishes on outside walls or on a stand that is on the ground.
And the HDX1000 looks like a small dish on purpose.
If the HDX1000 were mounted on a stand on the ground the HDX1000 will likely require more height for better reception of WPVI 6 ABC.
As always when antennas are installed and aimed at a starting direction the antenna is then turned to the left and right to find the best direction for reception. For this situation WPVI channel 6 is to the south East.