Sometimes you’ll want a wire that goes between two mobile chunks, which wires aren’t great for. This is what the antenna blocks are for. They can transmit any signal just like wires over an unlimited distance (as long as both the transmitter and receiver are currently in the loaded world).
Antennaa transmitter and receivers are paired by moving a frequency token between them. This token indicates which frequency they should transmit/receive on. The token is taken from the transmitter to the receiver (acquired by interacting). Many receivers can receive a signal from a single transmitter.