Feng Shui teaches that it is okay to build a house under a tall building (mobile phone tower)?

First of all, it is definitely not good for a house to be built under a tall building. The height refers to the height of the other building.

It should be at least twice as high as the original house.

Secondly, if you are next to a mobile signal tower, it is even worse. This kind of high-frequency signal is particularly harmful to the human body

Generally, you should stay away from this kind of signal. Master Ta said it was two hundred meters away.