100 meters, without considering losses, simply running the wiring and securing it is a major challenge. With so many layers, having a thick black cable exposed outside the window would be problematic, as I'd worry about my neighbors upstairs complaining.
Personally, I still recommend placing the main unit on the top floor, such as in the elevator room, and referring to how telecom operators place their room-based equipment. It's also important to coordinate with the property management regarding electricity bills and other related matters.
If you've already installed the shortwave antenna on the roof, and you add another device to it, along with paying the electricity bill, I don't think there should be any problems.
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