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DBI is rated over Isotropic...The Isotropic antenna technically only exists in a vacuum.

There are several antenna GURU's that will state the Horizontal Dipole over good Earth has the possible gain of 8 dbi.

I am with Just Me that antenna has a gain of maybe 6 DBd (6db over a dipole)

Did you also notice that Monster weighs 36 lbs...No TV rotor hold that up for long!

That should require a HAM III or HAM IV rotor.

I'll take a 4 element yagi...Horizontal at 30 to 40ft... ANYDAY over that antenna.

IMHO:)