[TowerTalk] Stacking SteppIR and 6M7JHV

Lou Laderman lladerman at earthlink.net
Mon Oct 19 16:04:09 PDT 2009

Mike, I have appx. 7 foot mast with a SteppIR 3 element am M2 2M12 and an M2 6M7JHV stacked (the 6M antenna is on top). My stack can be seen on my QRZ.com listing. You should have no issues with interaction given the space you have available on your mast. Your 2M antenna is better on top from a wind loading perspective.


Lou, W0FK

>Message: 3
>Date: Mon, 19 Oct 2009 17:14:45 -0400
>From: "Michael M. Raskin" <rask1553 at bellsouth.net>
>Subject: [TowerTalk] Stacking SteppIR and 6M7JHV
>To: <towertalk at contesting.com>
>Message-ID: <B4FCE0BF8F244F8FBB34E80CC360A91E at owner09e36b8a8>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>	reply-type=original
>Guys - I need some advice on stacking on a 15' mast.  I will have 
>approximately 13" of usable mast and want to have a 3-element SteppIR with 
>the 40/30 adder (16' boom) at the bottom of the mast, but I also want to use 
>the M2 6M7JHV (30' 8" boom) above it.  The SteppIR will not interfere with 
>the 6M7 as I can make transparent by retracting the element.  If possible, I 
>would also like to use a M2 2M9 (14' 6" boom) 2M beam as well.  Should I put 
>the 6M beam on top and the 2M beam between the 6M beam and the SteppIR, or 
>should I put the 2M beam on top?  The one antenna that I don't want to 
>degrade the performance of is the 6M beam.  I can live with the SteppIR and 
>6M7 and ditch the 2M beam, if the three are too close for comfort.  I know 
>the SteppIR can do 6M and is a good performer with the extra passive 
>element, but it will never perform as well as the 6M7.  So my real question 
>is:  do I go with only the 6M7  about 10' above the SteppIR (need 3' above 
>6M7 for truss) or can I slip a 2M beam on the mast as well without degrading 
>6M performance?  And, if so, where is best to place the 2M beam?  I think I 
>already know the answer that I'll get:  use only the 6M and SteppIR, but I 
>just want to be sure.
>Mike, W4UM 

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