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April 16, 2024 7:18 am  #1


U.S. Stn. Experiments With Antenna That Requires Less Height & Land

Ever heard of HEBA? It's short for High Efficiency Broadband Antenna, a new design that requires a radio tower to be of much lower height and use much less land to send out a signal. That potentially could reduce the use of expensive land needed to house all the equipment it takes to keep a station on the air. 

The FCC in the U.S. has allowed one outlet to experiment with the new technology, a small place called WQVR in Webster, Mass. The technology has been in development for at least six years.

The station is an AM oldies outlet on 940 AM, and for now, the signal is very low. But one of the huge costs for many stations is the valuable land their equipment sits on. Could they then sell much of it off for a great profit if this thing works?

"WQVR’s HEBA is 75 feet above the ground, situated on 2,500 square feet of land. With just one tee-joint welding, Poulos said the antenna has sustained through multiple New England nor-easters and severe weather outbreaks.

Poulos believes that with its reduced height, and no need for a large, buried ground system, the HEBA could be a way for AM stations to monetize the current property they operate from."

You can read more and see a pic of the antenna here.

 

April 16, 2024 9:00 am  #2


Re: U.S. Stn. Experiments With Antenna That Requires Less Height & Land

This is a version of the infamous Crossed-Field Antenna (CFA) which has been debunked by many eminent engineers.  See the Wikipedia article here:
https://en.wikipedia.org/wiki/Crossed_field_antenna
The article contains a link to a good summary of all the failures.
https://web.archive.org/web/20120211233734/http://www.antennex.com/Stones/st0806/ant_prop.html
It appears that the only ones still operational (at the time the article was written) were in Egypt.  All others have been abandoned as failures.
The actual efficiency of the antenna is a mere fraction  (3% to 17%)of a standard quarter-wave monopole.
There is no free ride, and you can't violate the laws of physics, particularly Maxwell's Equations. 

CKNT in Mississauga utilizes an 85 foot high Valcom antenna (manufactured in Guelph), and it has a reasonable radiation efficiency of around 200 mV/m at 1 km (for 1 Kw), but it utilizes a standard proper ground system of around 1/4 wavelength.

 

April 16, 2024 9:55 am  #3


Re: U.S. Stn. Experiments With Antenna That Requires Less Height & Land

This is why I love this board. Where else can you get that kind of expert info? Thanks for filling in the blanks. I'm just sorry the thing doesn't work as advertised, since it could possibly help save AM stations.

     Thread Starter