Articles
Technical articles on antenna theory, construction, and RF fundamentals.
SWR — What It Actually Tells You (and What It Doesn't)
Why resonance matters more than SWR. Reflected power round trips, common-mode current on the coax shield, RF choke trade-offs. Real numbers for HF and VHF.
SWRImpedanceResonanceSimulation
Antenna Reciprocity — Why Your Antenna Works the Same on TX and RX
Lorentz reciprocity theorem proves that any passive antenna has identical gain, pattern, and impedance on TX and RX. What people mistake for non-reciprocal behaviour is always power asymmetry, noise floors, or propagation.
ReciprocityLorentzTheoryMyths
"My Antenna Works Great!" — Compared to What?
Why antenna performance claims need a reference. What dB, dBi, dBd, and dBm actually mean, and how to make grounded comparisons instead of guessing.
dBdBidBdGainFundamentals