I would call the power company, & "show them" what is happening. I have a light pole the power company said could never be arcing, or making noise on a dry night. You could physically see the electricity arcing, & hear an erratic buzzing sound. Never told me what it was; but I have a feeling the insulator was cracked, or split. They didn't argue anymore after the power went out at that pole!
You might have to have them raise the wire several feet, or bury it!