On Mon, 31 Oct 2005 17:26:18 -0700, matt weber
said in rec.radio.scanner:

On Mon, 31 Oct 2005 05:57:39 -0500, Al Klein
wrote:

Dipoles (or ground planes) have, by definition, 0dbd gain.

Incorrect, gain is normally quoted over an Isotropic radiator, which a
Dipole is NOT.

Normally advertising hype is quoted in dbi, while honest antenna gain
is quoted in dbd. So is engineering gain.