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Antenna Height
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by ve4mm on March 25, 2003
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I may be able to operate a contest here on top of a 40 storey building. About 400' - 500' above grade.
A could install a tribander but nothing for 40 or 80.
Any benefit for contesting, say 10 Meters or Sweeps?
73, Mike
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RE: Antenna Height
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by k4uj on March 28, 2003
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One of the things that you will have to consider will be the amount of noise from elevator shaft motors and sheer amount of electrical devices inside of this building.
Most elevators have the motors installed on or near the roof of the building and generate lots of EMI. It is one of those things that you won't know until you try. Good luck.
Paul K4UJ
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RE: Antenna Height
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by kd2rd on April 28, 2003
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Do whatever you can for 40. Maybe you can utilize some type of add-on kit for the tribander, or use any type of shortened antenna. Then for Sweepstakes
( particularly CW ), you can just focus mainly on 40 & 20 with a little 10/15 & probably do rather well.
Good Luck !
John
KD2RD
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RE: Antenna Height
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by AC5ZO on April 30, 2003
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Height is an obvious advantage, but when you say "on top of a building", I am not sure if you mean your station location would be on the roof. There will almost always be wind at that altitude and danger from storms and electrical discharge is greater.
Any triband antenna should give good low angle performance at that height but the super low angle pattern comes at the cost of breaking up the higher angle pattern into multiple lobes. So, you might make more contacts or not, but they will certainly be to different places than the guy using your same antenna at 100 ft.
If you want to operate on 40/80/160, then halfwave center fed dipoles supported by kites or thrown over the side of the building might work. Remember that when you are on the roof, you are also 400-500 ft from a good RF ground, so RFI could be bad to severe. Avoid any endfed wire where you need to work the antenna against a ground.
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