Fabricating Coax Cables for Experimental Aircraft - HomebuiltHELP Watch in HD on YouTube! Share on Facebook! Radios and navigation equipment used in Experimental aircraft require custom coax cables for connection to their antennas. This video Tip discusses the best coax cable to use in an aircraft as well as demonstrating how to install the BNC connectors to the cable ends. The ability for the builder to fashion their own cables is a skill that will provide benefits for years to come.