[TowerTalk] Inverted L..........

Jim Brown jim at audiosystemsgroup.com
Tue Dec 25 13:35:33 EST 2007

On Tue, 25 Dec 2007 12:19:11 -0600, AD5VJ  Bob wrote:

>I have two 10 footers of ROHN25 with an 8 footer top section 
>now, but dont have it installed yet.

>Looks like I am going to need 4 more sections of ten feet before
>its all over.

If all you want is a vertical for 160 and/or 80, there are lots of 
ways to build them from relatively simple and cheap telescoping 
tubing, TV mast sections, etc. with suitable guying and electrical 
bonding together of the sections. I've seen some very nice miltary 
surplus mast sections that would work very well. Use copper for 
the top guys to form the top loading, rope for the others.  Just 
be careful that they can't fall where they cross a power line, 
hurt someone, or break something. :)

Those masts that were holding wires on my house and garage in 
Chicago were el-cheapo TV mast on el-cheapo tripods. Let's say you 
put two 10-ft sections on the corner of the peak of your roof, run 
a wire from it down to the ground, and use that as your feedpoint. 
You've got the length of that wire plus the length of the mast, 
and you put top-loading on that. 

One caution with the rope -- don't let rope contact the antenna at 
a high voltage point. I've had my 160 dipole drop when the antenna 
arced to the moist rope and melted it (with 1 kW). 


Jim K9YC

More information about the TowerTalk mailing list