root wrote in
:

When you are measuring gain, if dBi isn't specified it is normal to
assume dBd. I cannot get that JoGunn page to load and display, but

George,

Fundamental relationships depend on dBi, it is dBd that is the fudge.

dBd seems to have its popularity from the mistaken view by some that
because it is not possible to construct a real isotropic radiator, that dBi
doesn't have a real meaning.

Owen