Portable Design: Includes 4 mini ring receivers, lightweight and portable, can be placed in your pocket, suitable for home or travel use. Red medium wave donut (500kHz-2000kHz), blue shortwave (4MHz-24MHz) donut, golden donut high frequency antenna UV UHF + VHF FM mini loop antenna, 400MHz-470MHz, 80MHz-150MHz SMA, compatible with HFDY, Malachite, DSP, DSP2 radio receivers. Improvement: Enhances sound quality to provide better reception and improves shortwave listening performance. Compact and easy to carry, features variable capacitance tuning to improve signal reception, ideal for use with Malachite receivers. Applicable Radio Stations: One antenna with dual functionality, improves reception for shortwave radio stations and is suitable for all FM and SW radio stations. Easy to Assemble: This loop antenna is simple to set up and requires no adjustment, ideal for broadcasting in limited spaces. High-Quality Materials: These short-loop receivers are made of high-quality PCB materials, offering stable performance and long service life. This antenna is a narrow-band high-impedance resonant antenna and must be used with the high-impedance input port of the Malachite receiver; otherwise, the antenna may become detuned and unable to function. Donut Blue SW Shortwave Antenna Frequency Range: 4MHz-24MHz Donut Red AM (MW) Medium Wave Antenna Frequency Range: 500kHz-2000kHz Donut Gold Frequency Range: 400MHz-470MHz; 80MHz-150MHz SMA (interface is SMA male with pin) Note: Product appearance, color, and printed characters may vary between batches; these differences do not affect functionality. Color: As shown Material: PCB Dimensions: Red Medium Wave Antenna: Approximately 100x120mm Blue Shortwave Antenna: Approximately 100x120mm Gold UV UHF Antenna: Approximately 115x100mm Gold VHF FM Antenna: Approximately 50x60mm Package Contents: 1 x Blue SW Shortwave Antenna 1 x Red MW Medium Wave Antenna 1 x Gold UV UHF Antenna 1 x Gold VHF FM Antenna