The Roadking is renowned as the longest mobile antenna on the market, making it ideal for DX enthusiasts. Due to its length, it is not advised to have it attached while driving, but it can be conveniently split in half for storage. The antenna consists of a bottom section measuring 1437mm and a top section measuring 1335mm and features a 3/8 fitting. When fully installed, the Roadking extends to a total length of 108 inches or 9 feet. 

With its impressive length and design, the Roadking antenna caters to those seeking optimal performance for long-distance communication. Its unique feature of splitting in half ensures easy storage when not in use. The specific measurements of 1437mm for the bottom section and 1335mm for the top section, along with the 3/8 fitting, contribute to its functionality and versatility. Overall, the Roadking stands out as a top choice for DX'ing enthusiasts looking for a reliable and efficient mobile antenna solution. 

The Roadking mobile antenna stands as a standout option for DX'ing due to its exceptional length and performance capabilities. While it is not recommended for use while driving, its ability to split in half facilitates convenient storage. The detailed specifications, including the measurements of the bottom and top sections and the 3/8 fitting, highlight the antenna's quality and suitability for long-distance communication needs.