The Diamond WD-330 is a high-performance antenna that meets professional standards, making it suitable for amateur and military applications. This wideband folded dipole antenna operates from 1.8 MHz to 30 MHz, maintaining a standing wave ratio (SWR) below 2:1. For optimal performance, it can achieve a perfect 1:1 SWR at any frequency when paired with an external antenna tuner (ATU). However, this is generally unnecessary for amateur bands. With a power rating of 150 watts PEP, the WD-330 can be installed in various configurations, including horizontal (flat-top), inverted "V," or inclined, with the lower end up to 2 meters from the ground.

Constructed from durable vinyl-coated #14 copper wire, the Diamond WD-330 features an intermediate insulator protected by epoxy resin, ensuring longevity and reliability in various weather conditions. The antenna kit includes an S0-239 type connector, two insulators, and 30 meters of high-quality coaxial feeder cable (5D-2V) with pre-fitted PL259 plugs, simplifying the installation process for users. The WD-330J variant is available without the coaxial cable for those who prefer a more streamlined option.

The Diamond WD-330's specifications highlight its versatility and efficiency. It operates at 50 Ohms impedance and measures 25 meters in length. The SWR performance is particularly noteworthy, with ratings of 2:1 from 1.8 to 4.9 MHz, 1.5:1 from 5 to 15.9 MHz, and 2.0:1 from 16 to 30 MHz. This combination of features makes the Diamond WD-330 an excellent choice for amateur radio enthusiasts seeking a reliable and adaptable antenna solution.