Get a DP with a display, capable of extending up to 10 meters, with both ends detached from the building. See if the distance is sufficient for your needs. The downside is that the two sides are blocked by the buildings, and the range is only in two directions, unlike the inverted V and upright V which can cover four directions. This may be slightly more expensive.
There's also another one,
This is a cheap option; buying a finished product for 200 RMB, and then purchasing a barrel and wire separately, can be done for around 100 RMB.
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