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[quote:c7d5a3f6ab=”pianoplayer88key”]Question about the 3 meter limit … is the ground lead legally whatever is connecting the transmitter to physical earth ground …[/quote:c7d5a3f6ab]
Yes. That “ground lead” can consist of one or more conductors of any form (wire, tower, metal pole or whatever) that are electrically bonded together so as to provide a continuous conducting path from the ground terminal of the Part 15 tx to a connection at/on the physical earth.
[quote:c7d5a3f6ab]OR, could you put the tip of your antenna about 164′, 156’9″, 152’10”, or 146’6″ (etc)[/quote:c7d5a3f6ab]
Presumably you would want your Part 15 tx and antenna to have a conducting path leading down the tower to a physical earth ground, which means that the sum of that ground lead and 3-meter Part 15 radiator would greatly exceed the 3 meter limit. Also — those tall supporting towers may not function properly for their primary use if they are grounded by a Part 15 installation.
The total length of the Part 15 conducting path to a physical earth ground really is part of the radiating portion of the antenna system. If that total, composite “ground lead” conductor length is longer than the “3-meter antenna” portion, it will radiate more r-f field than the 3-meter section itself.