You can always place yourself in some sort of giant cage of faraday,

use some chicken wire, steal wire-netted, to make a giant cage of Faraday as big as your room, make sure there are no holes in it... your room will look pretty strange but no electric / magnetic distortion can enter that cage... you will recieve 0.0 % radio signals.

Above is the real freaky solution for your prob, better is follow Dbl_Tap's advice