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Proper assembly of the corner insulators is crucial. Troubleshooting: Understanding the F/B ratio adjustments. Conclusion
by Les Moxon, G6XN , a former communications engineer and radar expert.
It frequently exceeds 25 dB to 30 dB, effectively silencing heavy QRM (interference) coming from behind your station.
If your resonant frequency is correct but your front-to-back ratio is poor, inspect the gap (Dimension D). Use a non-conductive spacer (like a piece of PVC or plexiglass) to lock the gap distance securely into place.
14 AWG or 16 AWG stranded copper wire (insulated wire changes element lengths slightly due to velocity factor). hf antennas for all locations moxon pdf hot
You can find several Moxon antenna build guides online that use everything from copper wire and PVC to fiberglass fishing poles. However, if you prefer a ready-to-install solution, there are excellent commercial options available.
73 & good DX! 📻
The crucial air gap separating the driven tips from the reflector tips.
One of the greatest engineering feats of the Moxon rectangle is its native . Unlike a Yagi (which often drops to 20 or 25 Ohms and requires a Gamma match), you can feed a Moxon directly with standard RG-8X or RG-213 coaxial cable. The Mandatory Addition: A 1:1 Churn Balun Proper assembly of the corner insulators is crucial
High-frequency (HF) radio operators constantly face the challenge of balancing antenna size, directional gain, and portability. Whether you are battling strict Homeowners Association (HOA) rules, setting up a temporary base for Emergency Communications (EmComm), or operating from a remote mountaintop for Summits on the Air (SOTA), finding an antenna that works flawlessly in all locations is a rare feat.
sat in his workshop with a radical idea: a beam antenna that didn't require a massive tower or a massive backyard . He eventually shared these secrets in his legendary book, HF Antennas for All Locations , published by the Radio Society of Great Britain The Secret of the Rectangle
Clear schematics on how to construct the central "spider" or hub that holds the spreader arms securely at 90-degree angles.
The rectangular shape allows for robust corner bracing, which survives high-altitude winds much better than long, drooping dipole elements. 3. Maritime Mobile and Coastal Installations It frequently exceeds 25 dB to 30 dB,
The "ideal" HF antenna has traditionally been viewed as a full-size half-wave dipole or a monoband Yagi. However, these antennas present a logistical challenge for operators living on small lots, in apartments, or in communities with strict Homeowners Association (HOA) covenants.
The Moxon Rectangle folds these elements. The tips of the driven element and the reflector are bent 90 degrees inward, facing each other. This geometry yields several distinct advantages:
: Many hams use the MoxGen software by AC6LA to calculate precise dimensions for their specific operating frequency.