I'm not sure that you understand what he is wanting to do. He is staying 300 feet above the valley, but wanting to have coverage on the mountain up to 3,000 feet. Opposite of what it looks like you are thinking.
On the other hand, I am at 4,100 feet needing coverage down in to the valley, and that is why I have downtilt.
Mick - W7CAT
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----- Original Message -----
From: "Keith via groups.io"
To:
[email protected]Sent: Friday, March 07, 2025 03:17:45 PM
Subject: Re: [repeater-builder] Reality check on capabilities of GRMS repeater
Couple things to keep in mind with all this.? ?Running a high gain
antenna with a high HAAT can cause coverage issues in the valley below. Gain in an antenna is accomplished by changing the radiation pattern from equal in all directions to a certain direction in the case of a Yagi or across a single horizontal plane with an onmidirectional.? When you pull the RF down from above it doesn't cause a problem for the most part. But when you pull the radiation from below then there is a hole directly under the antenna.
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