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TACYAGI-70 Polarization for FM, SSB and Digital Work

Use the TACYAGI-70 vertically for typical FM work and horizontally for the guide’s SSB and digital use; polarization mismatch can erase much of the advantage of a directional antenna.

TACYAGI-70 Handbook CHA TACYAGI-70 Reviewed 2026-07-19
Start with the practical answer: Use the TACYAGI-70 vertically for typical FM work and horizontally for the guide’s SSB and digital use; polarization mismatch can erase much of the advantage of a directional antenna.

Why this matters in the field

Polarization mismatch can consume much of the directional antenna’s link advantage.

Use the antenna the way its geometry was built to work

The current guide documents a 13.7-ounce, sub-18-inch folded three-element UHF Yagi with 7 dBi published gain, greater than 15 dB front-to-back ratio, a 100 W rating, and less than 2.5:1 SWR across 400–470 MHz. In the field, that advantage still depends on element order, full extension, direction, polarization, mounting, and UHF feed-line loss.

Use this sequence

  1. Step 1: Identify the destination mode.
  2. Step 2: Confirm expected polarization.
  3. Step 3: Rotate the entire antenna consistently.
  4. Step 4: Keep coax from pulling the boom.
  5. Step 5: Compare received signal.
  6. Step 6: Label the configuration.

Read the result—not just one meter

  • Change one important variable at a time and restore the baseline before the next comparison.
  • Separate what was observed from what was inferred. Signal level, decoded quality, impedance, SWR, audio reports and error rate are different measurements.
  • Repeat the test. A result that cannot be reproduced should be recorded as provisional rather than turned into a general rule.
  • Use the lowest practical test power and preserve screenshots, analyzer files, photographs, radio settings and location notes.

The shortcut that causes trouble

Changing polarization randomly while also changing aim. This shortcut hides the limiting subsystem and can create an incorrect repair or operating conclusion.

TACYAGI-70 is UHF, not VHF. Its physical frequency range does not authorize transmission on every covered frequency, and a 1/4-20 camera thread or adapter-supported 3/8-24 path does not make every support structurally interchangeable.

Source boundary

CHA TACYAGI-70 Operator’s Manual, Rev. 2/7/2025. Confirm the current rule, guide, frequency, configuration, site, and safety limit before acting.

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