A:AnswerNo, MP3 mostly need 3.5mm male
What you need is a headphone splitter, they have1 3.5mm male and 2 female port for the 2 headphones.
ThIs is a RCA adapter used on old consoles like DVD.
A:AnswerSearch for a Composite RCA to Coax (f-type) adapter. They are usually little boxes with the needed jacks, and they usually need to plug in to the wall for power. I have one that has a switch to let you choose between channel 3 or 4. They might be listed as RF Modulator.