Buy a small walkie-talkie, like the QuanSheng TG-A1 or Hytera G32, and pre-program the frequencies on a computer. Also, bring a standard wired headset (QuanSheng uses K-head headsets, while Hytera uses standard 3.5mm headsets) to plug into the device to avoid broadcasting externally and for discreet communication. These small walkie-talkies are compact enough to fit in your pocket.
If the repeater is only a few kilometers away, and you can buy a standard handheld radio for around 100 yuan, you could even purchase a Hytera S1 mini and place it in a pen case.
Antenna? Even this small antenna is sufficient, but if it's close enough, you can use it indoors. If it's far away, you need to find a specific location with good height and visibility. With the 770, you have to pull out all the antennas when connecting, which is too conspicuous. I don't want to get caught by the teacher or security personnel!
Dear viewers, I appreciate your kind reminder to the original poster to study hard. However, based on my own experience, playing and learning are not mutually exclusive. There were many excellent students in our high school experimental classes who loved to play and had a lot of fun, but their academic performance was also very good.
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