Dipole
Is the smallest, simplest, most practical type of antenna
that can be made
but that also exhibits the least amount of gain.
Has a fixed gain over that of an isotropic radiator of 2.15
Ex. Antenna gain of 5 dBd equals (5+2.15 ) 7.15 dBi.
dB dipole (dBd) is the relative measurement of the
antenna gain when compared to a dipole antenna
at the same frequency