Polarization Myths on HF: An Educational Teardown of “Vertical vs EFHW” Claims

Educational teardown of Ask Dave (Dave Casler, K0OG) ... focusing on polarization + “vertical vs EFHW” claims.

Timestamped corrections ... what’s solid, what’s missing, what’s just wrong

Notes ... “Mostly OK” means the statement is directionally correct, but may still need context to avoid becoming a myth-by-omission.

▶ 00:31 — BigIR basics ... mostly OK, but “full size” needs a reality check

The BigIR is genuinely a motor-driven, variable-length radiator concept (no classic traps), and it is intended to be used with a radial system. The “full size on 40 m” language is where people get tricked ... the radiator length is essentially quarter-wave territory on 40 m, not half-wave.

Why it matters ... a quarter-wave vertical is a ground-system antenna. If the radials/ground loss are weak, the “antenna efficiency” and takeoff angle story changes fast, regardless of how fancy the radiator is.

▶ 00:44 — “SteppIR ended ham production” ... time-dependent, and “why” is often guessed

The “SteppIR later announced ending consumer/amateur production” claim is time-dependent and can be true depending on when the clip was recorded and when you’re reading this. The common problem ... hosts add motive (“they’re focusing on government/business”) as if it were confirmed in the clip.

Keep the logic clean ... report what’s stated publicly, and label everything else as inference.

▶ 00:54 — “My reference vertical beats almost everything” ... plausible at his QTH, not a rule

This is the classic YouTube trap ... a true personal result gets narrated as if it were an antenna law. Vertical performance can be excellent ... but it is extraordinarily sensitive to soil, radial field, nearby conductors, height above ground, and common-mode current on the feedline.

If you want this claim to travel beyond one backyard ... you need controlled A/B testing (same band/time, near-simultaneous switching, stable power, comparable noise floor).

▶ 01:20 — “Vertical = vertical polarization, EFHW = horizontal polarization” ... misleading

Polarization is not a brand label ... it is geometry + environment. An EFHW can be installed as a flat-top (mostly horizontal near broadside), a slope (mixed), or an inverted-L (mixed). A “vertical” can radiate mixed polarization too, especially with ground interaction and feedline/common-mode effects.

The practical takeaway ... describe the installation (height, slope, proximity, feed routing, choking) before you make polarization claims.

▶ 01:26 — “All HF skywave arrives circularly polarized” ... wrong in the way that breaks understanding

HF skywave polarization is variable. The ionosphere is a magnetized plasma ... waves can split into modes, rotate, and arrive as linear, elliptical, and sometimes near-circular depending on path, frequency, time, and multipath.

The correct mental model is “polarization becomes unpredictable enough that simple V-vs-H certainty fades.” That’s not the same as “everything is circular.”

▶ 01:33 — “Horizontal and vertical receive equally well” ... sometimes, not guaranteed

Sometimes you do see similar receive levels because polarization is rotating and multipath is mixing modes. But local noise polarization, antenna pattern, elevation angle, and the station environment can strongly favor one orientation over the other.

A dirty truth of HF receiving ... “what hears better” is often more about noise coupling and pattern than polarization purity.

▶ 01:39 — “V/H are 3 dB down versus circular” ... only under strict conditions

Yes, in a pure textbook case ... a linear antenna receiving a perfectly circularly polarized wave collects half the power (3 dB). But HF skywave is often not perfectly circular, and the “sense” can change.

Presenting “3 dB down” as a universal rule is how myths are born ... it’s a conditional result being narrated as law.

▶ 01:50 — “Circular only works straight up” ... incorrect framing

Circular polarization is not an “only overhead” technology. Real CP antennas have a usable beamwidth; off-axis axial ratio degrades, so CP becomes more elliptical ... but it does not stop existing.

On HF specifically, the ionosphere often “scrambles the neatness” anyway, so CP-vs-linear purity arguments rarely survive the real path.

▶ 02:27 — Small transmitting loops ... the scary capacitor voltage is real

This part is basically correct ... small transmitting loops can develop very high RF voltages across the tuning capacitor (kV is plausible). The exact voltage depends on loop size, Q, frequency, and power.

If someone treats a loop capacitor like “just another variable cap” ... that’s how you get arcs, burns, and destroyed components.

▶ 03:44 — Stainless loading-coil loss ... plausible, but don’t turn it into a universal dB number

As a principle ... stainless has much higher resistivity than copper or aluminum, so a stainless coil can add meaningful loss and heat. But “this antenna is 3 dB down” should never be treated as universal ... the ground system, band, tuning, and common-mode control can dominate the outcome.

The correct version ... “lossy coils can waste power as heat ... quantify it, don’t mythologize it.”

▶ 04:34 — Don’t drive stakes into park lawns ... solid practical warning

This is one of the most useful “real-world” moments in the clip. Sprinklers, irrigation lines, shallow utilities ... and many parks simply prohibit ground penetration.

▶ 07:42 — Remote tuner at the antenna ... mostly correct, but it’s not a magic “efficiency fixer”

A remote tuner at the feedpoint can reduce SWR on the coax run and therefore reduce SWR-related coax loss. That’s real.

What it does not do by default ... fix radiation/ground loss, create missing radials, or automatically suppress common-mode current. You still need the boring stuff ... counterpoise/radials where needed, and choking where needed, so your feedline doesn’t become part of the antenna by accident.

What to actually learn from this clip

• Don’t label polarization by antenna nickname. Describe the installation geometry and environment first.
• HF skywave polarization is variable. Faraday rotation and mode splitting are real ... but “everything is circular” is not a correct simplification.
• Personal A/B results are not universal laws. If you want “rules,” you need controlled comparisons.
• Remote tuners manage mismatch on the feedline. They don’t automatically fix losses, radials, or common-mode behavior.

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