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How close is too close?

John Becker wrote:

If I mount the 144mhz and the 440mhz along
with the 2.4G grill antenna on the same boom.
How close is too close to each other?

Wayne replies:

My 2400 MHz BBQ dish is about 1 foot away from my 435 MHz CP yagi.  I don't notice any desense.
My 144 MHz and 435 Mhz CP yagis are about 6 feet apart.  No desense with mode B, minimal desense with mode J.

Wayne Estes W9AE
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