What does a signal combiner do?

Quote from the video:
Quote from Youtube video: The combiner reduces transmitter noise and protects receive frequencies from that noise several factors are used to measure signal loss in a combiner cavity.

How do I combine antenna signals?

Quote from the video:
Quote from Youtube video: And not getting multipath interference is purchasing a UHF VHF combiner. These work by combining two antennas. But separate in the frequencies.

How do you split cable wires?





Quote from the video:
Quote from Youtube video: If you tighten it up tightly. Just like that and then you take your other. Device or your other cable that you want to send the signal to and you tighten it up on the other end.