Jųan, What you have is an RF generator. If you had a spectrum analyzer you would be surprised at how many different frequency's you circuitry is transmitting. What you need to do is to place your circuitry into a metal enclosure and place either PI filters on the output wires from the enclosure if any or, low pass filters on the output wires from the enclosure if any, and ground the circuitry to the enclosure.

Dave Purola,
N8NTA