I used a 50-9 pure copper, multi-strand core cable to run 100 meters up the tower at the base. The results over the entire shortwave range were quite good. Theoretically, the attenuation at 30MHz is close to 3dB, but in practice, I didn't notice any difference. The power output was not sufficient for the amplifier, and the sensitivity was insufficient to open high-gain amplifiers. This highlights the importance of adapting to specific needs; what works best depends on individual circumstances. In fact, it would be better to use thicker feeder cables. Ultimately, I didn't end up changing them, but I used them this way first.
Also, I wanted to mention that feeder cables with the same diameter are generally lighter than feeder lines. The copper-clad aluminum core of the feeder cable is solid, and some solid copper-clad aluminum feeder lines made of foam material are also relatively light. I have a roll of 80 meters of 90% copper-clad aluminum feeder line that I bought cheaply at 2 yuan per meter from communication engineering waste materials. When compared to a 40-meter SYV50-7 pure copper feeder line, it's even slightly lighter. However, the biggest drawback of solid copper-clad aluminum feeder lines is their stiffness. If you're using them in the field, it's best not to. Hanging a 100-meter feeder cable from the top of the building is actually not very heavy (the 80-meter copper-clad aluminum I had originally intended to use for this purpose, but unfortunately, the top of the building wouldn't allow me to mount it, so I ended up using it at the base).
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