[VHFcontesting] 6 meter antenna heights

[aa4zz at aol.com]

I operated the 10 Meter Contest several times from a mountaintop with a 4 or 5 element yagi on short (18' or so) tower. One day I felt that the antenna was not operating as it should. I then realized that I was parked directly under the antenna. I moved my jeep an the antenna started working as it had before.

73 Paul AA4ZZ


-----Original Message-----
From: Stu Benner <w3stu at myactv.net>
To: vhfcontesting at contesting.com
Sent: Fri, 7 Mar 2008 7:22 am
Subject: Re: [VHFcontesting] 6 meter antenna heights



Our contest group operates from a mountain top at a commercial broadcast
facility. We suffered from lackluster 6M performance for our first couple of
years. Our 6M yagi was mounted on a mast attached to a one-story building at
the site. The antenna was about 1 wavelength above ground level. The light
went off for us when realizing that although the antenna was 1 w.l. AGL, it
was only about 0.3 w.l. above a significant amount of conductors (in the
form of feedlines and supporting structures within the building). We moved
the antenna such that it was greater than 1 w.l. above those conductors and
away from the building. This resulted in significantly improved performance
for us under non-Es propagation conditions. In short, remember to consider
all conducting surfaces (e.g., vehicle body) near the antenna.

Regards,
Stu
W3STU
Boonsboro, MD
EMConsulting
www.emcwizard.com

> -----Original Message-----
> From: vhfcontesting-bounces at contesting.com 
> [mailto:vhfcontesting-bounces at contesting.com] On Behalf Of 
> specrisk at aol.com
> Sent: Thursday, March 06, 2008 21:05
> To: vhfcontesting at contesting.com
> Subject: [VHFcontesting] 6 meter antenna heights
> 
> 
> In the past 3 VHF contests I have worked my 6 meter antenna 
> (3 ele beam & ho loop) have been low. I was running 10 watts 
> as SOP and my 6 meter performance was lackluster. Antenna 
> height was about 15 ft. which worked okay? for the higher 
> bands. I plan to operate as a rover in June and I can go to 
> 30 Ft for 6 meters given the time to set it up. Power will be 
> higher so it will be hard to make a direct comparison but as 
> respects the June contest I? think putting an emphasis on 6 
> meter antenna height is critical. What has amazed me is that 
> my microwave antennas were? very low ( about 8 feet) but the 
> height was less of a barrier.Having MW capability is great 
> but if you are looking for score,? 6 meters is still the 
> "magic band". George, W1JHR 
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> 

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