BG7MGW I saw the 5-unit single U antenna you made, and I was also considering making one myself. It's definitely cheaper, like the U5V3 from Chengdu M on Bilibili, which costs only 100 yuan. However, if you consider the cost of a good antenna as well, it would probably be around 300 yuan or more. So I was planning to buy a finished product first, mainly because I don't have much free time.