[AMRadio] 160 meter antenna


robertcharles at att.net robertcharles at att.net
Mon Jan 12 07:23:24 EST 2009


Neal. Thanks for the link on building the Unipole. I had worked for Sprint for some time and I noticed they were using that same concept on many of their towers. The link was exceptionally helpful 
-------------- Original message from neal Newman <cozy659 at yahoo.com>: -------------- 


> Jim you only need 50 feet of verticle space. 
> why not just build yourself a Folded Unipole antenna if you Dont know how. Ask. its really easy. Just Run 3 lengths of #12 wire or if you have it #6 wire. short them up at around the 50 foot point and use 1" PVC 
> Tubing as Insulators with clamps Down the side of the Tower. 
> at the bottom Each wire is isolated with PVC from the Tower. 
> BTW Each wire should be about 12" or more off the tower. then Tie all 3 wires together with a ring of #12 and take that as the Lead to the antenna tuner. Run at Least 4 ground radials 50 feet long If you can get 
> the space make them 120 feet... 
> and you will have a Killer 160 antenna. if not make an inverted L Run a wire thats 130 feet long. as far vertically as 
> you can then run the rest out horizontally... again you need at least 4 ground radials.... the unipole is what we use for 
> Broadcast stations when we are tight for height or space on a grounded Tower. 
> 
> Neal-KA2CAF 
> CE- WTTM/WHWH/WJDM/WIBG/WFYL 
> 
> 
> --- On Sun, 1/11/09, Jim Miller WB5OXQ in Waco wrote: 
> 
> > From: Jim Miller WB5OXQ in Waco 
> > Subject: [AMRadio] 160 meter antenna 
> > To: "Discussion of AM Radio in the Amateur Service" 
> > Date: Sunday, January 11, 2009, 11:28 PM 
> > I always wanted to try am on 160 but like most do not have 
> > enough room for a full size antenna, so, 
> > I am considering building a 160 meter antenna at our 
> > clubhouse because there is a 80' tower there and over an 
> > acre of land to spread out a 1/2 wave dipole. Question is; 
> > 1 Is a 1/2 wave wire dipole the best antenna for the band 
> > considering there is room for it. 
> > 2 Is 80' high enough for the center of the inverted V? 
> > 3 How high do the ends need to be off of the ground? 
> > 4 Should I feed it with coax or ladder line to the 10' 
> > level (or other) then a balun to coax to the tuner (coax is 
> > the only acceptable line into the shack)? The shack is a 
> > metal building 30X60' and directly below the tower. 
> > There is no way to get ladder line to the operating position 
> > since all cables have to run through a 3" conduit for 
> > at least 30'. 
> > 
> > The tower is a free standing commercial tower made of 4 
> > 20' sections bolted together with a 2 meter and a 440mhz 
> > antenna at the top, all ham antennas. 
> > 
> > Thanks for any advice. Jim 
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