Products & Product Reviews

New Product Spotlight: Ciro Mazzoni Radio to Loop Antenna Tuner Interface Cable for the Elecraft K-4

In today’s new products spotlight, OnAllBands has some welcome news if you own an Elecraft K-4 and are looking for an outstanding magnetic loop antenna.

Ciro Mazzoni now offers an interface cable that allows Elecraft K-4 Series transceiver users to connect its BABY Loop (6.6-29.8 MHz), MIDI Loop (3.5-14.5 MHz), or the STEALTH loop (6.6-29.8 MHz) antennas to the ATU 2.0 Automatic Tuning Unit. The ATU 2.0 allows these antennas to resonate the loops throughout their wide frequency ranges without coverage gaps: 80 through 20 meters for the MIDI, and 40 through 10 meters with the BABY and STEALTH models.

Interface cables are also available for Icom, Yaesu, Kenwood, Flex, Elad Duo, and Elecraft KX-3 rigs

What do hams say about ATU 2.0 Interface Cables?

Five Stars: “The interface cable matches the ATU and my IC-7300 perfectly (MZZ-ICOM-CAT-CBL). This is a must have item!”

Ciro Mazzoni loop antennas by I3VHF are all compact, easy-to-install, and ideal when you’re dealing with limited space but still want high-power handling compared to other transmitting loops. All three options make excellent choices for those faced with HOA restrictions.

Measuring only 54″ x 19.6″ x 10.2″, the low-profile STEALTH Loop is made from strong, powdercoated aluminum alloy and features a typical SWR of 1.3:1, a 6 dB front to back ratio, 25 dB front to side ratio, 50-ohm input impedance, and 125W power rating.

The 78.7″ diameter MIDI Loop is made from tough, aircraft-grade aluminum and comes with a large and robust air-variable capacitor made of hefty aluminum plates. It features a typical SWR of 1.2:1, front to side ratio of 25-35 dB, 50-ohm input impedance, and maximum Input (PEP and CW) of 300W from 3.5 to 7 MHz, 800W from 8 to 14.5 MHz.

The 39.8″ diameter BABY Loop is also made from aircraft-grade aluminum and comes with a large capacitor with plates welded directly to opposite portions of the top of the loop like the MIDI. It has a typical SWR of 1.3:1, front to side ratio of 25 dB, back to front of 6 dB, 50-ohm input impedance, and maximum input (PEP and CW) of 450W up to 21 MHz, 1 kW from 22 to 29.8 MHz.

Find all gear from Ciro Mazzoni at

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