The reason was that I lived in an old courtyard (all reinforced concrete buildings), with high-rise buildings blocking the signal, resulting in a low signal strength (three stories). The only radios I had were UV-K6 and TG-K10AT, making it impossible to communicate with repeaters within the neighborhood (the closest repeater was about 10 kilometers away). After being persuaded by several teachers in the group, I started researching DIY antennas. The older members of the group recommended Moxon and Cju antenna designs, even downloading calculation software. Eventually, while searching online, I found a post:
https://www.qsl.net/py4zbz/antenas/ms.htm
After considering factors such as difficulty of construction, available tools, and portability, I plan to implement the last design mentioned in the post:
Start recording!
The list of materials is as follows:
PVC pipe: 1 meter long, with one each of outer diameter 20mm and 25mm pipes, one each of 20mm and 25mm end caps, and one 20mm-25mm variable diameter connection joint.
304 Stainless Steel Bar: Length 1 meter, diameter 2.5 mm, sold in quantities of five or more.
Brass Couplers: 3mm - 3mm, four
Retraction ring: 2.674mm, fourteen
Screw - Nut - Washer - Spring Washer: M2.5 x 10, at least four.
SMA female connector welding cable: 0.5m, one piece
The purchase records indicate that there was excess material used, based on two sets of finished products.
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