The one next to the drain pipe is
From the 6th floor to the 2nd floor, I used a two-way cable that was discarded directly from the exterior wall. For HF, I think a cable of 50-3 is sufficient. This one seems too thick and noticeable, but since I already had a 20-meter cable with connectors, I just used it directly. I installed expansion bolts on the concrete wall at the top floor, secured the cable with a clamp, and attached a weight made of cement to the clamp as a backup anchor. Finally, I used a 50-3 cable to run into the house through the air conditioning duct.
Actually, in our older residential complex, we used to have solar panels with pipes. However, because it was difficult to run the wires through and also required running visible wires from the bathroom to the bedroom, it wasn't as convenient as simply dropping them down.
I've seen experienced local enthusiasts install antennas on their rooftops, with several antennas simply running cables directly from the exterior wall. With buildings over 30 stories high, it's impossible to see them from below; people instead go outside through air conditioning vents or create small holes themselves and seal them with clay.
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