The MFJ-933 Small High-Efficiency Loop Tuner, Jr. is a compact and versatile tuner for amateur radio, covering 5.3 to 29.7 MHz with up to 150 watts of power. It features a detachable mount compatible with MFJ PVC Cross Loop Antenna Kits, allowing users to create a self-contained antenna system without the need for grounding or radials. A simple wire loop can be quickly set up for multi-band operation.

Supporting circular, square, or rectangular loops, the tuner performs best with a circular quarter-wavelength design. It delivers efficient performance with strong low-angle DX signals and reduced static noise for clearer reception.

Ideal for apartments, travel, or portable use, the MFJ-933 is lightweight, easy to carry, and quick to deploy—making it a practical solution for reliable amateur radio operation anywhere.

• Powerless: No power supply required.  
• Maximum Input Power:  150 Watts (all modes)
• Easy-Carry Handle:  Permits easy handling to/from portable location(s)
• Small Physical Profile: 6 ¼” W, 9 ½” D, 5 ¼” H
• Low Radiation Angle: Rivals full size dipoles.  
• Quiet Reception:  Extremely quiet receiving antenna.  Hi-Q rejects out-of band interference, reduces overloading, and rejects harmonics.
• Indoor Use:  Perfect for apartments & hotel/motel rooms, antenna restricted, and portable locations.

For full specifications and setup guidance, check the manual here.