Hf Antennas For All Locations Moxon Pdf -

HF Antennas for All Locations by L.A. Moxon (1982) is a definitive guide on constructing high-performance, space-efficient antennas for amateur radio, particularly popularizing the 2-element "Moxon Rectangle" design. The book provides practical techniques for optimizing HF performance in limited spaces by focusing on antennas with high front-to-back ratios and direct 50-ohm feeds. View the original text at Internet Archive

HF Antennas for All Locations : L. A. Moxon - Internet Archive hf antennas for all locations moxon pdf

Part 8: Performance Comparison – Moxon vs. The World

To convince you that the Moxon truly belongs in every HF operator’s arsenal, here is a quick performance matrix (for a 20m antenna at 25 feet height): HF Antennas for All Locations by L

| Antenna Type | Gain (dBi) | F/B Ratio | Width | Noise Immunity | | :--- | :--- | :--- | :--- | :--- | | 1/4λ Vertical | 0 | 0 dB | Very small | Poor (high noise) | | Half-Wave Dipole | 2.15 | 0 dB | 33 ft | Fair | | 2-Element Yagi | 6 | 15 dB | 18 ft (boom) | Good | | 3-Element Yagi | 7.5 | 20 dB | 24 ft (boom) | Excellent | | Moxon Rectangle | 5.5 | 28 dB | 13 ft (boom) | Excellent | Part 8: Performance Comparison – Moxon vs

The Verdict: The Moxon yields 91% of a 2-element Yagi’s gain but with superior front-to-back in half the space. For crowded bands, the F/B ratio is more important than 1 dB of gain.

1. Theory & Advantages Over Other Small Beams

• Why a Moxon beats a dipole + reflector or a conventional 2‑element Yagi at the same size.
• The self-canceling side lobes and deep rear null.

Example Table from Such a PDF (20m Moxon – Wire Version)

| Parameter | Value (wire dia. ≈2 mm) | |---------------------|--------------------------| | Driven element A | 10.20 m (33.5 ft) | | Reflector element B | 10.65 m (34.9 ft) | | Element spacing | 2.38 m (7.8 ft) | | Wire gauge | 14 AWG (1.6 mm) copper | | Feedpoint Z | 50–65 Ω | | Boom length | 2.38 m (minimal) |

(Cut lengths are approximate — always trim for lowest SWR at your desired frequency.)