BI7KHZ First, try using a different antenna, such as a handheld antenna with an adapter, a vehicle-mounted antenna, or headphones and wires. See what communication signals you can receive. If you can receive any signals, then consider installing an antenna at home.
Even if you receive a signal, it doesn't necessarily mean you can broadcast it. However, even if you don't receive a signal, broadcasting could also be disruptive. If you can receive a signal, try searching the forum using the keywords "阳台" (which translates to "balcony") to see what others are doing.
Regarding the effectiveness of the communication system, it's possible that no one will receive a message, especially in areas like 野架. It is more likely that people in high-rise buildings won't receive messages either. Therefore, you should have realistic expectations.