Vertical Launch Angle
The number of dipole rows and the height of the lowest element above ground determine the elevation angle and consequently the distance to the service area.
- A 2-row high array has a typical takeoff angle of 20°
- is most commonly used for medium range communications.
- A 4-row high array has a typical takeoff angle of 10°
- is most commonly used for long range communications.
- A 6-row array is similar to a 4-row, but can achieve 5° to 10° takeoff angles. This antenna type can be used in shortwave communications circuits of 12000 km, and is highly directional.
Note that it is possible for details of the antenna site to wreak havoc with the designers plans such that takeoff angle and matching may be adversely affected.
Read more about this topic: HRS Antenna
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