"On all the time".
It is probably a local noise source. Replace antenna with a known good dummy load, or short the antenna jack (don't transmit!) and verify you lose the signal. This verifies it is incoming via the antenna jack. If you do not lose the signal it is incoming via the power lead, ground lead, or by direct radiation. Nice to know before trying to locate and cure!
The answer here is "distance, filtering, and shielding", that is distance from your antenna to the source, filtering, and shielding the local source.
Next is getting the radio on a battery and powering down the house breakers.
-Mike.