[towertalk] antenna stacking

[Jordan, David]

You wont get 3dB at best for a 3 element yagi on 20m using a 30'
spacing is 2.5dB max.  Add in an additional say 20' of cable say rg213
and you will have more loss. say another .25dB.
That assumes there is no VSWR loss.

I currently have 2 6 element tribanders at 71 and 39' stacked
I use 25' RG213 to feed both and a simple switch.  I do not adjust for VSWR
you can get a stackmatch form WX0B

Yes I pick up about 2.5 dB gain but what's more important
is the take off angle and reduced fading.
Besides stacking 2 24' antenna is a lot easier than trying to keep a 60'
boom one up
and you have the ability to split the stack if designed right

David Jordan, Pr. Antenna Engineer
> Automotive Telematics and Commercial Antenna 
> M/A-COM,  A tyco INTERNATIONAL LTD. COMPANY
> 1011 Pawtucket Blvd. Lowell, MA 01853, MS 158
> ph: 978-442-4190  fx: 978-442-5419
> jordand at tycoelectronics.com
> www.macom.com
> 
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