Feed back problem on FM Radio after new 100 amp box installed
Many small power supplies emit high frequency signals into the air or power line. Also LED bulbs have those issues. Sometimes turning the plug, helps - e.g. in case of schuko or Euro plugs. This can't be done with outlet systems  where the hot line has to be at a  fixed position.

Sometimes it helps to rotate the receiver by 90 degree. What nearly always helps is to enlarge the distance resp. to connect the loader and receiver to different circuits far from each other. 
Also different positioning or grounding of the antenna might help. 

The grounding wiring of the complete house/Appartment should be done in star form. Earthing/Ground Loops could easily catch any signals which then enter the ground of the receiver electronic.