ShengDa Com SDN4VU Spring Loaded Dual Band NMO Mobile Amateur Ham Radio Antenna

The ShengDa Com SDN4VU Spring Loaded Dual Band NMO Mobile Amateur Ham Radio Antenna is a high-quality radio antenna designed for amateur radio enthusiasts who require a more versatile and flexible antenna for their mobile applications. The SDN4VU model is designed to be mounted on a vehicle or fixed location using an NMO mount and features a spring-loaded base that allows the antenna to flex and bend in windy conditions.

The SDN4VU antenna is a dual-band antenna, which means that it is capable of transmitting and receiving signals on two different frequency bands: VHF and UHF. The RX VHF frequency range is 136-174 MHz, while the RX UHF frequency range is 400-470 MHz. Optimized frequencies are 144-148 MHz and 430-450 MHz. This makes the SDN4VU antenna ideal for use with mobile radios, base stations, and other transceivers that operate in these frequency ranges.

The SDN4VU antenna is constructed using high-quality materials to ensure durability and reliability. The antenna is made of stainless steel, which is resistant to rust and corrosion, and the base is made of high-strength magnet materials. The antenna is also designed to be weather-resistant, so it can be used in all kinds of weather conditions.

This antenna has a total length of ~20 inches, (50 CM) and it has a gain of 2.5 dBi on the VHF band and 3.5 dBi on the UHF band. The antenna also has a power rating of 100 watts, which means that it can handle high power transmissions without being damaged.

One of the best features of the SDN4VU antenna is its spring-loaded base. This allows the antenna to flex and bend in windy conditions, which helps to prevent damage to the antenna or vehicle. The antenna is also designed to be easy and robust to install, thanks to the NMO mount. 

Overall, the ShengDa Com SDN4VU Spring Loaded Dual Band NMO Mobile Amateur Ham Radio Antenna is an excellent choice for amateur radio enthusiasts who require a more versatile and flexible antenna for their mobile applications. Its dual-band capability, durable construction, and spring-loaded base make it a great choice for a wide range of amateur radio applications.