NDB Symmetrical T-Antennas

The Symmetrical "T" Antenna is the optimal land based antenna system when adequate space is available.
A Low Power Symmetrical "T" Antenna is recommended for use with a 125 - 250 Watt transmitter, if sufficient land is available. A High Power Symmetrical "T" Antenna is recommended for use with a 500-1000 Watt transmitter, if sufficient land is available.
The Symmetrical T-Antennas are available in following heights:
  -   30Ft (9m) Low Profile
  -   60Ft (18m) Low and High Profile
  -   90Ft (27m) Low and High Profile
  -   120Ft (37m) Low and High Profile
  -   200Ft (61m) Low and High Profile
The standard Symmetrical "T" Antenna is supported by 10ft sections of above ground level Support Towers placed 300ft apart. Range depends on the field strength required, the ground condition, and the power radiated. However the higher the antenna a better efficiency and therefore better coverage will be obtained.

NDB Mast Antennas

A Mast Antenna can be used if sufficient land is not available for a Symmetrical "T" Antenna. A portion of the top set of guy wires is used to form the top hat for this antenna
A Mast Antenna is electrically inferior to a Symmetrical "T" Antenna of the same height due to the decreased top loading. Top loading serves two purposes; decreasing the input reactance and consequently the voltage on the antenna and increasing the effective height.
34ft Mast antenna is a self-supporting and has capacitive top loading and inductive center loading. It is designed for use where land area is at a premium and low frequency operation is desired. A perimeter wire around the top hat radius enables the antenna to reach all frequencies desired. It is easy to install with one person. Other Mast antennas are Guyed (i.e. not self-supporting) herefore require more space for installation. The Symmetrical T-Antennas are available in following heights:
  -   34Ft (11m) Self-suporting Mast Antenna
  -   40Ft (12.19m) Guyed Mast Antenna
  -   50Ft (15.24m) Guyed Mast Antenna
  -   60Ft (18.29m) Guyed Mast Antenna
  -   90Ft (27.4m) Guyed Mast Antenna
  -   120Ft (36.54m) Guyed Mast Antenna
  -   145Ft (44.2m) Guyed Mast Antenna

NDB Helipad H-Antenna (Offshore)

This Longwire antenna is designed to be installed around the perimeter of a helideck. The Helideck NDB Antennas give the approaching pilots the signal they need to find the helideck every time in any weather. The Helipad Antenna is a longwire antenna designed to be installed around the perimeter of a helideck. The kit includes antenna wire, insulators, 8 support poles and hardware.

The recommended distance between support arms is roughly 46 ft. (14m) apart for a 300 ft. (92m) antenna. Shorter lengths require fewer support poles. Support arms are required at each corner or angle of the deck. Antenna comes with 8 support poles.

Please see below "ORDERING INFORMATION" for diffrent options and relevant part numbers.