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Depending on the exact frequency, 102 inches IS 1/4 wavelength on 11 meters. Use 234/f for 1/4 wave; 468/f for 1/2 wave.

If you're serious about a center-fed vertical dipole, remember that without something like Hustler uses in their mobile antennas ("Resonators"), it's going to be ~18 feet from end to end, and you'll have to bring the coax straight away from the antenna for as far as possible (but at least ~18 feet). You might be better off with a plain 1/4 wave ground plane.

And the brick and concrete building -- does it have rebar in the walls? HVAC ducting, lighting and piping? You'll want to stay as far as possible from them.

[QUOTE="Beetle, post: 524249, member: 1066"] Depending on the exact frequency, 102 inches IS 1/4 wavelength on 11 meters. Use 234/f for 1/4 wave; 468/f for 1/2 wave. If you're serious about a center-fed vertical dipole, remember that without something like Hustler uses in their mobile antennas ("Resonators"), it's going to be ~18 feet from end to end, and you'll have to bring the coax straight away from the antenna for as far as possible (but at least ~18 feet). You might be better off with a plain 1/4 wave ground plane. And the brick and concrete building -- does it have rebar in the walls? HVAC ducting, lighting and piping? You'll want to stay as far as possible from them. [/QUOTE]

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