You Tube Videos of the Shared Apex Loops in operation -
Dayton 2014 Antenna Forum Presentation by Mark Bauman, KB7GF and inventor
of the Shared Apex Loop
Introducing the Shared Apex Loop ArrayTM!
Now, you have a new interference fighting weapon in your
The Shared Apex Loop ArrayTM is a revolutionary receiving
antenna that will
change the way that you listen to the radio! The patented design
performance in a size and over a range of frequencies that will
please both the
rag-chewer and DX’er alike.
The antenna is a true-time-delay array with four identical wire
by a single non-conductive mast. Signals from each loop are
through a ferrite coupler to a short balanced line that connects
to the switch/
combiner/amp enclosure mounted at the base of the antenna.
enclosure, signals from each loop are routed either directly to
a combiner or
through a delay line and then to the combiner, where they are
amplified by a
dual stage balanced broadband amplifier and sent out to the
feedline to the
controller located in the shack. The controller connects
directly to your
receiver, and sends power and control signals over the feedline to the
Three models to chose from
AS-SAL-20 - optimized for VLF, BCB, Low Band
DXing, and shortwave to 15MHz, 24 foot tall andj approximately 40 foot footprint
AS-SAL-12- optimized for BCB, and 3-30MHz , 16 feet
tall, and approximately 28 foot footprint
AS-SAL-30 - optimized for VLF, BCB, 160/80/40m Dxing
"Shared Apex Loop Array: A Wideband Directional Receiving Antenna for
500 KHz - 30 MHz"
Effective communication on the LW, MW, and SW bands requires more than
just a careful ear. You need the right gear to navigate through the
jungle of interference that can be as close as your computer, or as
distant as a thunderstorm on the other side of the globe. Interference,
though isn't just a challenge for DX'ers - it's a challenge for net
operators, rag chewers and county hunters too, military operations - in
other words, it is a challenge to all of us!
We have developed a new type of receiving antenna that delivers
exceptional directivity in a small package and is useable over a wide
range of frequencies without need for adjustment. This new antenna is
called the Shared Apex Loop Array antenna and it opens the door to a new
class of compact, high performance, wideband receiving antennas
developed for both amateur and professional users.
The antenna operates on the
rather than the more traditional phased array methods. This method of
operation enables outstanding bandwidth. For example, a 18 foot tall, 18
foot radius array can provide outstanding front-to-side and good
front-to-back performance for continuous frequency coverage below 500
KHz to 16 MHz with good sensitivity above 1.8 MHz! A 10 foot tall, ten
foot radius array provides continuous frequency coverage between 500 KHz
to 22 MHz with good sensitivity above 5 MHz.
The patented and additional patent pending designs provides the
Compact Size, light weight
Wideband operation without need for adjustment
Ground independent operation
Outstanding front-to-side ratio
Ease of Construction, and simple single feed line control for data
Portability for DX-peditions, quick deploy operations, field day
operations, emergency operations
Easily remote controlled with the Shacklan - 4 USB interface
to your PC or a Ethernet Everywhere device.