Conclusion of LMR400 and RG58’s differences
RG58 has a significantly higher loss due to changes in insulation and electrical characteristics (attenuation). It's perfect for its initial application, which is mostly in cable television, but not for Helium antenna systems, especially over such a long distance. LMR240 is the basic minimum for 15 meters, however everyone in the community strongly recommends LMR400.
Although LMR400 cable has low loss, it is thicker and less flexible than RG58 or LMR240 cable, making it more difficult to work with. It comes in lengths ranging from 2' to 100' and is designed to be used with antennas and amplifiers that don't come with cabling.
If you want to learn more, try to follow the below link to see the article about RG58 VS LMR400.
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