6-20 meter portable magnetic loop antenna that is perfect for a Stealth or Technician Class operator who needs a system that can modularly expand into the General and Advanced bands.
Use our Make an Offer Program and Click this button if you can’t afford full price.
Out of the box, the MagLoop enables 6 through 20 meters to be tuned for TX/RX with the following efficiencies when compared to a resonant dipole installed 1/2 wavelength high. Later, you just add the 15-40M option to expand your operating privileges along with the efficiency of this antenna.
SWR
Tuning for 6 through 20m goes right up against the bottom at 24MHz and upper limit at 54MHz. So, reshaping of the loop into an oval for 6-10M and then into a circle for 12-20M is necessary. Here are images of the re-shaping and SWR results for each band.
|
|
|
|
|
|
|
|
|
Efficiency
With a total circumference of 2.18055 Feet, this magnetic loop antenna with a 0.32-inch conductor diameter exhibits the following calculated efficiencies.
| Efficiency Chart | ||
| Center Frequency
of each Band |
S-Units loss from a resonant dipole
installed at 1/2 wavelength |
Antenna
Efficiency |
| 6M, 52MHz | 0.62 | (-3.7 dB below 100%) |
| 10M, 28.85MHz | 1.87 | (-11.2 dB below 100%) |
| 12M, 24.94MHz | 2.22 | (-13.3 dB below 100%) |
| 15M, 21.225MHz | 2.60 | (-15.6 dB below 100%) |
| 17M, 18.118MHz | 3.00 | (-18.0 dB below 100%) |
| 20M, 14.175MHz | 3.62 | (-21.7 dB below 100%) |
REFERENCE CALCULATOR Small Transmitting Loop Antenna Calculator • 66pacific.com
For higher efficiencies on 15 to 40 meters, use the 100W VHF UHF HF EmComm MagLoop Antenna.
Evolution of Efficiency
In 2014 Alpha Antenna offered a built-in LED tuning aid that would light up at approximately 5 Watts when the loop was tuned. We removed the LED, which activated at about 5 W, because it diverted power from transmission. Without the LED, more energy is radiated, improving antenna efficiency.
Usage
- Setup: Deployable in 60 seconds.
- Modes: This Stealth MagLoop is especially useful on 6-20 meters for all-mode High-Q listening & weak signal TX operations for SSB, CW, and Digital modes.
- Usage Scenario: Placement on a table or desk inside a Covert Emergency Response Vehicle, Office, Apartment, Camper, Tent, or anywhere else where space is limited.
Results
The following signal reports are SSB contacts made from California over a 2-hour period on 20-meters and 10-meters:
| Band | 20 Meters | |
| Signal Report | Call Sign | Location |
| 5/3 | N6FCM | California |
| 5/3 | KA6NPD | California |
| 3/3 | KC7DTR | Utah |
| 5/2 | N6WL | California |
| 5/5 | KJ7RPL | Oregon |
| 4/3 | KK7MIE | Idaho |
| 5/4 | W2AJG | Arizona |
| 5/5 | KG7MAN | Oregon |
| 5/1 | N6WL | California |
| 3/2 | W3LBY | Oregon |
| 2/3 | KK7OJK | Washington |
| 4/3 | W7NFR | Oregon |
| 5/5 | K7KNB | Oregon |
| 4.3/3.2 | AVERAGE SIGNAL REPORT | |
| Band | 20 Meters | |
| Signal Report | Call Sign | Location |
| 5/5 | KD9REG | Indiana |
| 5/5 | K0MJ | Kansas |
| 5/3 | KC5NVZ | Texas |
| 5/3 | KS0MIK | Kansas |
| 5/3 | K0PJR | Kansas |
| 5/3.8 | AVERAGE SIGNAL REPORT | |
Specifications
| Parameters to Follow | Specifications of the Antenna. |
| Operating Parameters | MAXIMUM POWER: 50 Watts PEP SSB, 25 Watts CW, 10 Watts Digital.
FREQUENCY COVERAGE: 54MHz to 14MHz (6 Meters to 20 Meters). IMPEDANCE: 50 ohms. |
| Usage Parameters | DIRECTIONALITY: Semi-Directional
PURPOSE: NVIS & DX |
| Physical Parameters | SIZE: 10-inch diameter
MOUNT: Female 5/8-11″ IP RATING: IP-53 CONNECTOR: 50-ohm Female BNC |
Upgradable for Technician Class to General Class licensees
- The logs and math show that this loop is most efficient on 6-meters and 10-meters.
- These bands are what Technician Class license holders are licensed to transmit on.
- This antenna also has good receive on 12, 15, 17, 20 meters, so Technicians can also listen in on those bands till they get their General License.
- This MPAS loop is upgradable from a Technician Class operator to the General Class with the purchase of the EmComm Loop Mast and Inner/Outer Loop for VHF, UHF, & 15-40 Meters add-on.
Assistance
FAQs: Alpha Loop MagLoop antenna
We Listen
We are dedicated to improving all of our Portable VHF UHF HF Antennas. Specifications and descriptions are subject to change without notice.