Where is an RF preamplifier installed?

An RF preamplifier is installed between the antenna and the receiver to improve the signal quality before it is processed by the receiver. This position is critical because the signals received by the antenna are often very weak, especially for distant stations or when conditions do not favor good propagation. By placing the preamplifier close to the antenna, it minimizes the loss of signal that can occur over the coaxial cable run to the receiver, ensuring that the weakest signals are amplified as much as possible before any further processing.

This setup allows the receiver to work with a stronger, clearer signal, improving overall reception and minimizing noise that could interfere with the desired signals. The other options involve locations where attenuation or signal degradation could occur, making them less effective for improving reception.