"Because the signal flows through you.
Sounds like you have a ground problem with your mp3 player or at your ground loop of your antenna."
That's the obvious answer, or at least the first thing that...
If you mean FM/AM radio: Radio reception is based off the bouncing of radio waves off of the upper atmospohere and ionosphere. But in the daylight, the sun causes molecular turbulence in those layers...
You may be in an area where the signal strength is low. Try moving the receiving box to a different position or near a different window, or even just turning it to a different orientation may help....
Move anything that could potentially disrupt the wireless signals. Make sure that no microwaves or phones above 5.8 GHz are it the frequency's path. Lastly make sure that the wireless device...