it's a very weak transmitter signal to begin with.
the problem is that you have got the transmitter
pushed up right next to your brain, and that may
be somewhat of a hazard (ionization of your brain
molecules).

the strength of any transmitted radio signal falls off
as the square of the distance, so, the solution would
be to run a wire to a very small ear-piece. (maybe
a microphone built into the ear-piece to pick up the
sound vibrations in your skull bone, for voice?)