"I did follow it and found roughly where it is. But, have not talked to that landlord. It is a 3 story building with a handful of apartments in an old stone and

"I did follow it and found roughly where it is. But, have not talked to that landlord. It is a 3 story building with a handful of apartments in an old stone and brick building locked at the ground floor (i.e. refection is a problem but I imagine signal strength outside the door would be a good indicator once inside)." Have you considered that what you are seeing is unintentional ? I myself have set up many different (RX only!) experiments in GNU Radio, etc., and had to leave them sit for weeks at a time while I was busy with actual work. Maybe someone was tinkering/playing/experimenting and just left it on ? I would suggest putting up a polite, but loud and eye-catching one page sign at the entrance to this building alerting someone that they are dramatically impacting their neighbors.