HFDY Active Magnetic Loop Antenna, 50KHz-500MHz HF AM FM VHF UHF Low-noise Amplifier, 17dB Gain Magnetic Loop Receiving Antenna for Ham Radio (with Improved Amplifier)
WIDEBAND ACTIVE RECEIVE ANTENNA: Covers 50 kHz-500 MHz for longwave, AM, shortwave, FM, aviation, VHF, and low-UHF listening. Designed for SDRs, portable radios, communications receivers, and receive-only radio setups—ideal for exploring more signals with one compact antenna system
LZ1AQ-DERIVED LOW-NOISE PERFORMANCE: The upgraded low-noise amplifier delivers approximately 17 dB gain at 10 MHz, with a low 1.2 Ω input impedance at 1 MHz. Its magnetic-loop design helps reduce local electric-field interference from common indoor noise sources, helping SDR and shortwave receivers pick up more usable signals
HIGH LINEARITY FOR STRONG-SIGNAL AREAS: With +15.5 dBm P1dB and +38 dBm OIP3 at 10 MHz, this active loop provides added headroom around strong local stations. It is well suited to wideband SDR scanning, shortwave listening, AM/FM reception, VHF monitoring, and digital-mode monitoring such as FT8 and JS8Call
SWITCHABLE LOOP MODES FOR YOUR ENVIRONMENT: Adjustable jumper and amplifier-board switches support multiple loop configurations, including Mobius-loop and electrostatic-shield magnetic-loop modes. Select the mode that best fits your location, signal target, and noise conditions; the Mobius configuration can provide approximately 2× the voltage gain of a standard small loop
COMPACT, FLEXIBLE INSTALLATION: A compact loop design fits balconies, rooftops, attics, and indoor receiving stations where long-wire antennas are impractical. The weather-resistant preamplifier enclosure and SMA connection system support flexible placement. Requires a 9-12 V DC power source; this is a receive-only antenna and must not be connected to a transmitting RF output
