Wall Mounting

For many building installations it may not be possible to install the antennas
above the penthouse or other structures for the building. Often it is necessary
to install the antennas onto the penthouse or water tank of an
existing building. When installing antennas onto an existing structure,
rarely has the building architect factored into the potential installation of
antennas at the onset of the building design. Therefore as shown in Figure
14-8, the building walls may meet one orientation needed for the system,
but rarely all three for a three-sector configuration.
Therefore it is necessary to determine what the offset from the wall of
the building structure needs to be. Figure 14-9 illustrates the wall mounting
offset that is required to ensure proper orientation for each sector.

Obviously, common sense must enter into the situation here when the
inclusion of the offset brackets makes the site a metal monster. Tradeoff can
be made in the design when the orientation for each sector is within the
design tolerance limits for sector orientation. The design tolerance should
be within  or  5 degrees for a three-sector cell.
Lastly, the wall mounting offset must all meet the setback requirements
for both antennas and local ordinances. 595