EFHW HT antenna functions without additional counterpoise
EIRP measurements of the 2m end-fed half-wave HT antenna from MFJ aids understanding a dipole is a dipole no matter where you feed it.
FDTD
Of fields and feedpoints
Understanding how feed position along the half-wave dipole antenna affects the electric and magnetic fields around it.
J-Pole Antenna – Should I ground it?
To function as intended, the J-Pole antenna needs RF electrical isolation from its mount. Here’s why and in technicolor no less.
Simulations of Classic & Broadband Hexbeam – The Movie
FDTD reveals Hex Beam behavior with real movies of magnetic and electric fields in time.