DescriptionThe mla-30 ring antenna is a broadband antenna and an effective antenna for short wave receivers (SWL) and HAM radio operators (HAM) to receive short wave and medium wave in urban limited living areas. Excellent directivity can help you reduce the noise and improve the signal-to-noise ratio.Features- Color: White. - Material: Stainless steel. - Size: About 20 x 18 x 4 cm. - Local radiated noise suppression up to 30 dB compared to long line antenna - 8 font orientation provides depth dummy points to further reduce interference. - Main coverage range: 100kHz to 30mhz, USB power supply, easy access. - Stainless steel ring vibrator, easy to install and easy to maintain. - Rainproof housing, can be fixed for long-term outdoor use. - By rotating the antenna to the antenna's dummy points to the jamming signal, the specific near-field interference can be minimized.