comparison table Magloop8 and BUTTERNUT HF6-V tested on the site:
Weak Signal Propagation Reporter Network (WSPRnet) http://wsprnet.org
TX antenna
Magloop8
SNR
HF6-V
SNR
Magloop8
SNR
HF6-V
SNR
Magloop8
SNR
HF6-V
SNR
28/11/2011
20m TX time
16:58
17:00
17:02
17:04
17:06
17:08
WA3DNM
-13
-13
nr
-13
-14
nr
KF3BH
-19
-20
-19
-23
-22
nr
AB1LD
nr
-20
-16
-16
-13
nr
LA9JO
+1
+0
-3
-7
-3
-12
M1CFW
-19
-15
-20
-16
nr
-20

 

products
download
tune
cable diagrams
review products
cavity filters
magnetic loop
buy in Europe
distributors
HOME
contact to us
KMK UK Limited
DOUBLE MAGNETIC LOOP shape figure 8
MAGLOOP8
products
download
tune
cable diagrams
review products
cavity filters
magnetic loop
buy in Europe
distributors
HOME
shop on line
buy in Europe
distributors
magnetic loop
cavity filters
review products
cable diagrams
tune
download
products
HOME
The 8 Shape Magnetic Loop is the best performing and most convenient small space antenna available to amateurs today.
Antenna covers range: 13 MHz to 30MHz.
The antenna consist from two loops 1 meter in diameter. The loop antenna element is constructed from 22mm high conductive copper pipe. Antenna tuning is carried out through a wired unit with power supplyer
The loop element Is tuned with a low-resistance, high current, special design variable butterfly capacitor. The capacitor is controlled by using variable speed motor remote control box The outdoor electrical and mechanical components are protected by an attractive weather resistant moulded cover.
Comparison antenna tests showed that this Antenna’s characteristics 3-4 time better to a conventional loop and similar or better vertical multiband antenna. Comparing test was made with vertical antenna BUTTERNUT HF6-V.
Antenna was tested on power 500 watt with power amplifier and been shows exelent result.

The reason for using a double loop is that two magnetic fields enhance each other and because the two loops are in parallel the impedance at the tuning point will be lower and the bandwidth greater compared to a single loop.

Special design allow use antenna for portable and very limited space with minimum assembling time and
not need PLANNING PERMISSION due to height lower then 3 m.

Antenna may be completely dismount in 5 minute and occupy space 1.0x0.5x0.15 m weight 8 Kg.

Copyright of the RSGB, reproduced here with Kind permission
Magloop8 2m above ground
BUTTERNUT HF6-V vertica with 32 radials in ground
nr - no report
SNR - signal - noise ratio report from WSPR stations in dB
TX power 20 watts
for test used program WSPR v2.11 by K1JT

All stations in system WSPR every even minute of hour had transmit coded test signal.
Duration of transmit 2 minute.
In normal conditions stations transmit and receive coded signals.
After received signal, station create report and sent over internet to WSPRnet site which then appear in common table on the site.
Program WSPR allow tune duration time TX and RX, in our case we tuned program only to transmit every 2 minute.
Antennas had manualy switching over every 2 minute on antenna tuner.

Above table show:
on long distance Magloop8 has same or even better result than BUTTERNUT
On the short distance (100-500km) Magloop8 SNR had weaker SNR than BUTTERNUT.
BUTTERNUT has vertical length - 9 m, Magloop8 hight above ground it was only 2 m .

 

How WSPRnet works
Finally, after a storm of rain during a week, i was able to test your antenna.
The results are VERY good!
I'm VERY impressed!
I had only about an hour before dark for testing....
I mounted the antenna in about 15 minutes. I'm impressed by the accuracy of the copper tubes and fittings; they went on without any effort.
My test was made on my garden, between a wall made of rocks and a hill to the south, and a steel gazebo to the north; apart from the gazebo, the north is totally open.
installation was made at a height of only ONE meter. No time to do anything better.
Tuning was straightforward. High speed to find the max noise, then low speed for fine tuning on SWR, sending dots in CW.
It was quicker to do, than to write it here.
I was on 20 meters: received signals were nearly the same S-value than with my Cushcraft Vertical.
I then transmitted ONLY three CQ calls in a row,  on CW, with 10 watts.
here are the results on the Reverse Beacon Network:
------
showing spots for DX call: IK4YNG

de                dx            freq       cq/dx        snr      speed          time
GW8IZR     IK4YNG    14028.5    CW CQ    16 dB    16 wpm    1734z 23 Feb
F5MUX     IK4YNG    14028.7    CW CQ    10 dB    16 wpm    1734z 23 Feb
LA5EKA     IK4YNG    14028.5    CW CQ    3 dB    16 wpm    1733z 23 Feb
SM2IUF     IK4YNG    14028.6    CW CQ    10 dB    16 wpm    1733z 23 Feb
SE0X         IK4YNG    14028.5    CW CQ    20 dB    16 wpm    1733z 23 Feb
SM6FMB     IK4YNG    14028.7    CW CQ    9 dB    16 wpm    1733z 23 Feb
SM6FMB     IK4YNG    14028.7    CW CQ    9 dB    16 wpm    1733z 23 Feb
OH6BG     IK4YNG    14028.6    CW CQ    17 dB    18 wpm    1733z 23 Feb
SK3W        IK4YNG    14028.5    CW CQ    26 dB    16 wpm    1733z 23 Feb
-----
As i said, i had only the north somewhat open, the installation height was ONE meter, and i was running 10 watts...
I'M REALLY IMPRESSED!
On March 7th i'll bring the antenna to the Montichiari "Contest University" meeting, where I'm a relator and have a stand. Several hundreds of Hams will attend.

IK4YNG Paolo
Review