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The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.

A range of easy-to-build RFI filters by John Regnault, G4SWX

Coaxial stub filters used at W7GJ

Will additional coax stubs improve Band Pass Filter performance?

When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters