A Multi-Frequency Network (MFN) refers to a network of transmitting stations where each station operates on its own distinct frequency. The primary purpose of using different frequencies for these stations is to avoid co-channel interference among the transmitters. Co-channel interference occurs when multiple stations use the same frequency within close proximity, leading to signal degradation and interference.

In broadcasting and telecommunications, frequency planning is crucial to ensure efficient and interference-free operation. MFNs are often discussed in contrast to Single Frequency Networks (SFNs), which involve multiple transmitters operating on the same frequency. SFNs are designed to work together cohesively to provide coverage over a larger area, typically with synchronized timing to mitigate interference.

In an MFN, each transmitter operates independently on its allocated frequency, allowing for greater flexibility in network design and avoiding the need for tight synchronization. This approach is particularly useful in scenarios where interference management and frequency reuse are challenging due to geographic constraints or other technical considerations.