[VHFcontesting] Stacking different Yagis

[Chet, N8RA]

John,

I don't think there is an easy answer to that.

What I do is model each antenna in EZNEC and then compare an antenna's
pattern by itself to various placements amongst the others. 

This is laborious at first but now with most of the antennas modeled it is
getting easier.  

GL, 73,
Chet

-----Original Message-----
From: vhfcontesting-bounces at contesting.com
[mailto:vhfcontesting-bounces at contesting.com] On Behalf Of John Kemker
Sent: Tuesday, May 12, 2009 3:28 PM
To: vhfcontesting at contesting.com
Subject: [VHFcontesting] Stacking different Yagis

I'm working on a tower project and it's nearing completion.  One of the
items I'm looking into is putting up four different yagis on four different
bands on the tower:

(From the top of the mast, down)
M2 432-13WLA on 70cm
Cushcraft 13B2 on 2m
Cushcraft A50-5S on 6m
Mosely CL-33 tribander on HF


How much vertical separation do I need between each antenna on the stack in
order to avoid unwanted interaction?

--
--JohnK
73 de W5NNH
10X 75371/M&M 117/SMIRK 6185/TRA 2499/Norcross 228 F&AM




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