An FM channel combiner constructed from two (2) four-section FM reflective bandpass filters will add two new frequencies to an existing three (3) constant impedance FM combiner system. The FI940 is a compact, folded design four-section FM bandpass filter with integrated non-adjacent coupling. This allows two FM channels as closely spaced as 0.8 MHz to be combined with group delay variation that meets the requirements for hybrid analog and HD digital operation. Some manufacturers use five-section filters for these applications, which increases group delay variation to values greater than the 600 nanoseconds maximum recommended.