BI1WAH The fundamental principle involves using a GP (likely referring to a specific type of device or technique), where a single wire acts as a transducer, and the wire is wrapped around a fishing rod. This method is very cost-effective, and a local enthusiast has several such setups installed in his home, with multiple fishing rods extending from his window.
The most confusing part for the original poster is likely how to implement the power feed point. It's quite simple: find a bare power feed cable with a connector, strip off the insulation and shielding, and solder the wire used as the transmitter onto the core. Then, you can either wrap or solder the ground wire around the shielding.
You can also find a flange. Search for "M-flange" on Taobao, and you'll find one. The core can be directly soldered to the wires, and the ground can be attached to the screws and nuts in the four corners of the flange. Alternatively, you can fix the flange to a waterproof box, which is similar to the coaxial and long cable boxes, but without the need for a barrel connector inside since the wires connected as the transducer don't require one.
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