The M-104 antenna is an excellent choice for amateur radio enthusiasts seeking a versatile and portable solution for in-vehicle operation. Designed to operate on four HF bands—7, 14, 21, and 28 MHz—with a power output of 50 watts PEP, this antenna is particularly suitable for Summits on the Air (SOTA) and Parks on the Air (POTA) activities. Its compact design allows easy transport in the included 180*110*30mm plastic box, making it an ideal companion for operators who enjoy field operations. One of the standout features of the M-104 is its ability to switch operating bands effortlessly by changing coils. With four coils labelled for specific frequencies, users can quickly adapt the antenna to their desired band, ensuring seamless communication.

Additionally, the antenna's 6-SIDED BOLT enhances its versatility, allowing it to be used in the 144/435 MHz bands, broadening its application range and compatibility with various communication systems. Enhancing grounding with the optional magnetic ground mat accessory is recommended for optimal performance, especially in automotive settings. This addition can significantly improve SWR adjustments and overall signal quality. With its comprehensive frequency coverage and user-friendly design, the M-104 antenna is a commendable choice for anyone looking to elevate their in-vehicle amateur radio experience.

The antenna system operates across a frequency range of 7, 14, 21, 28, 144, and 435 MHz, delivering a power output of 50W PEP. It features a UHF Male connector and extends to a length of 1.4 meters. The unit's overall dimensions are 180 x 110 x 30 mm, with a lightweight design at just 0.32 g. The list includes one whip antenna, one antenna base, and coils for 7 MHz, 14 MHz, 21 MHz, and 28 MHz, along with a 6-sided bolt for the U/V range, which is set to be available in 2023.