Final answer:
The correct answer is option 2) Receive signals.The primary function of a radar antenna during reception is to receive incoming electromagnetic signals, which are then amplified and converted into a format for end-user consumption.
Step-by-step explanation:
During the reception phase, radar antennas serve to capture incoming electromagnetic waves. These waves induce oscillating currents in the antenna, which correspond to the signals being received.
The antenna effectively converts the electromagnetic waves into electrical signals that can be processed. Some antennas are designed as large dishes that focus the signal onto a smaller antenna, improving the reception of the signals.
Once received, the electrical components within the receiver amplify these signals and then convert them into audio and/or video formats, suitable for consumption by the end-user. It's important to note that while antennas can sometimes have multiple functions, in the context of the reception phase, their primary role is to receive electromagnetic signals.