Explanation: Wideband FM (WBFM) signals, commonly used for local repeater operation, employ a significantly larger frequency deviation compared to narrowband FM (NBFM). This wider deviation means the modulated signal occupies a much broader spectrum, generating more numerous and significant sidebands. To properly receive and demodulate a WBFM signal without distortion, the Intermediate Frequency (IF) circuitry must have a sufficiently wide bandwidth to pass these sidebands. An IF selectivity of 15 kHz is appropriate for amateur radio WBFM, accommodating typical deviations (e.g., ±5 kHz) and the full range of modulating audio frequencies. Filters of 1 kHz are suitable for CW, 2.4 kHz for Single Sideband (SSB), and 4.2 kHz for NBFM or some digital modes. These narrower bandwidths would severely clip the WBFM signal's sidebands, leading to high distortion and poor audio quality.