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Commercial Radio Antennas - Please keep discussion related to professional, commercially used antennas and antenna systems for the two-way radio industry. Topics for the use of these antennas on amateur bands are accepted here.

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Old 09-19-2017, 11:24 AM
Join Date: Apr 2016
Location: Miami, FL
Posts: 2
Default DB-408 Bay Spacing Help


I just purchased a supposedly "new" set of DB-408 Dipoles with the phasing harness relatively cheaply, but they have no aluminum mast to mount them on. Looking at the specs I can see that the mast is just a 1.75 inch OD aluminum tube with 0.125 wall thickness and a pointed cap on the top. I believe I can source all that locally to complete the antenna.

The information that I haven't been able to find is what the bay spacing should be on the aluminum mast, or if that is even critical to the performance. Can anyone help me with that information? I sent a message to Commscope to see if they would help with the info but I'm not hopeful since I didn't buy the antenna "new."

Here is an image from the seller so you can visualize what I'm talking about:

Any help would be most appreciated,


- Erik
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  #2 (permalink)  
Old 09-20-2017, 10:21 AM
Join Date: Apr 2016
Location: Miami, FL
Posts: 2


Did some more searching last night and managed to find hand drawn diagrams of the DB-404 and DB-408 antenna's with measurements. Just thought I would add them here in case anyone else needs this info in the future.

I found them here:




There are other useful resources and diagrams located on that page too.

- Erik
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