VDA Physics — Why No Radials

Return current flows through the lower element, not buried radials. The 2" pole footprint lets you place the antenna in the quietest spot on your property. No radials, no traps, no coils. 160–6M from a single feedpoint with a compatible ATU.

RF Balance — Why Isolation Beats Symmetry

The tuner location decision, feedline options, and why a post-tuner balun is redundant when the chassis is properly isolated. The complete signal chain explained.

Wind Ratings & Structural Engineering

Every Greyline wind rating is derived from ASCE 7-10 structural engineering values. Height-specific: 12'=155, 16'=115, 20'=90, 24'=70, 28'=55 MPH. 2" OD. Graduated wall construction. The math is published because it holds up.

Antenna Comparisons — VDA vs. Everything Else

VDA vs. ground-fed monopole, trap-loaded verticals, 43' vertical, and competing flagpole designs. Side-by-side engineering comparison. OD, projected area, wind methodology, fulfillment.

7-Year Guarantee — For Real

When a customer's antenna fell in a severe ice storm, we sent a replacement immediately. No questions asked. That's the Greyline guarantee in practice, not just in print.

Related Pages

What Is a VDA? The Physics Explained →
RF Mastery: The Physics of Balance →
Technical Performance Data — Wind Ratings, Gain, EZNEC →
Antenna Comparisons — VDA vs. Everything Else →
Assembly Documents & Installation Guides →