The Diamond RHM-12 antenna is an impressive piece of equipment that caters to a wide range of amateur radio frequencies. This multiband antenna is designed for ease of use, covering the shortwave spectrum from 7 MHz and the 6m, 2m, and 70cm bands. Its quick-tuning capability allows users to effortlessly adjust the radiator, which is marked for quick identification of desired bands, ensuring a smooth operation during radio sessions. The quick-release fastener mechanism for extending or retracting the radiator adds to its convenience, making it an ideal choice for beginners and experienced operators. With a fully extended length of 2.75 meters, the RHM-12 is particularly well-suited for temporary portable operations.

While it is not waterproof and designed to handle higher wind speeds, its lightweight design at just 350 grams makes it easy to transport and set up. Users should ensure proper grounding during operation, especially when using a magnetic base on a vehicle, for which the Diamond MAT-50 magnetic mat is recommended. A shorter antenna rod is available for those looking to operate on the 70cm band, providing flexibility without needing a counterweight. 

The RHM-12 is versatile and robust, supporting a maximum power of 120W for SSB and 40W for FM/CW. Its omnidirectional design and PL connector make it compatible with various setups, enhancing its appeal. Whether you are an avid portable operator or simply looking for a reliable antenna for your home station, the Diamond RHM-12 stands out as a commendable choice, offering excellent performance across multiple bands.

The Diamond RHM-12 is a versatile multiband antenna designed for a 50 Ω impedance feeder, with stacking heights of 5/8 λ for both 2m and 70cm and a 1/4 λ configuration suitable for HF at 50 MHz. It supports a wide range of bands, including 40m, 30m, 20m, 17m, 15m, 12m, 11m, 10m, 6m, 2m, and 70cm, with optional support for 80m and 160m. Standing at a height of 2.75 meters and weighing just 350 g, the RHM-12 is designed for efficient performance across multiple frequencies.