Safe distance from phone mast

[rustydiver]

What is a safe distance away from a phone mast to fly.
The field I fly in has one in my the corner about 200 meters away behind me. When I take off I fly away from it.

 

[4wd]

The power output from the main antennas is quite low and unlikely to have any effect, however if it has microwave dishes on the side you might not want to get in the beam from those.
The mobile phone frequencies are a long way from what Mavic uses, there will be far more risk of interference from your own phone which is touching the controller - about none,