User blog comment:Shadow at Morning/Determination of the Size of Vale via Cartographic Analysis/@comment-226878-20150818022744/@comment-226878-20150818035101

Rewatching it, Ruby actually claims to have been able to see Signal. Given the size of Beacon, it's possible that Hunter schools are insanely tall. Maybe, despite not being able to actually see Patch, she chould see the tippy-top of the Signal tower.