Section 6: Specific examples of good/bad locations.
A flat rooftop is often a good Antenna site:
Normally, this building would be a major obstruction for SeaSonde. However, because the
Antennas are mounted on the roof, SeaSonde’s broad, horizontal Antenna patterns are not
blocked.
Notice the lack of obstructions on or near the roof. Water towers, Elevator Shafts, Television
antennas or satellite dishes on the roof, or power lines or tree branches nearby at roof level,
would probably make this site unusable. This location maintains the principle of Above
Ground Clear Area, even though it is elevated above the earth.
Raising Antennas on a 4-meter-high post is usually a good practice for roof mounting.
SeaSonde’s radio signals are partly absorbed by a flat roof, and raising the Antennas from the
roof reduces this effect.
Raising the Antennas above the roof also deals with the problem of Underground Clear Area.
At this location, the rooftop takes the place of the “Ground.”
A major advantage of this location is height above ground, which discourages vandalism.
Another benefit of this site is closeness to water. At this location, the Antennas are about 20
meters from the water.
