Introduction
The DX Engineering Linear-Loaded Multi-Band Dipole (Patent Pending) is a 74 ft,
lightweight yet rugged design that is usable with a tuner from 3.5 to 30 MHz. It’s ideal for
portable or tactical use and can be easily installed in attics, small lots or Covenant Condition
Restricted locations.
Features
•
Linear-loaded elements for the lower bands reduce wingspan over a dipole
•
High efficiency design gives dipole-like performance
•
No traps or coils
•
3.5 to 30 MHz continuous coverage
•
Correct design makes it easily tuned
•
Well-designed feedline reduces noise pickup over Windom types.
•
Insulated Elements and stainless hardware
•
Unique support line combats heavy ice loading
•
Black UV color ideal for concealment
The Linear-Loaded Multi-Band Dipole kit includes multi-wire elements which are covered with
a flat-black, lightweight UV-resistant material, custom molded high impact center-T support and
end-insulators, 100 feet of premium ladder feedline and 100 feet of double-braided UV-resistant
Dacron mounting rope. Stainless steel hardware is used for all connections.
The DX Engineering Linear-Loaded Multi-Band Dipole can be used successfully with the balun
incorporated in most high quality antenna tuners to obtain a low SWR across the entire
frequency range. Using an external current balun may provide better performance and permits
converting to coax prior to entering the operating position which will reduce RFI.
Mounting Considerations
When planning the location of your antenna, consideration should be given to the height,
location of suitable support structures and feedline positioning and length.
Generally speaking, these antennas should be mounted as high as possible for best performance.
Antenna height will affect the exact resonance point, radiation pattern, and takeoff angle. The
higher the antenna, the lower the takeoff angle to the horizon, which increases the effective range
of the antenna.
For DX, the minimum height above ground should be 1/2- to 1-wavelength at the lowest
operating frequency. On the low bands, this height becomes impractical for most hams. For
example, an 80m dipole at 70 feet is about 1/4-wavelength above the ground. This antenna
would be good for local and short distance communications, but not optimal for DX, due to the
high takeoff angle and ground absorption. A 40m dipole at 70 feet is approximately
- 3 -
1/2-wavelength high and is likely to be good for DX and less optimal for local or short range
communications. For more information on antenna design, feedline and radiation angles, consult
a reliable text such as the ARRL Antenna Book.
