Not all coaxial cables are created equal. The Radio Shack cheap stuff shields maybe 60% of the signal at low freqencies. At VHF (com) and transponder frequencies, it's shielding is maybe 20%.
There must be a reason why people will pay five to ten bucks a foot for the 100% braid double shielded coax for critical applications. Coupling between two cables is affected by the square of the distance. Work that out at 1/4" inch spacing for adjacent to 39" for opposite sides of the fuselage, and the difference in coupling is a very large number. Jim Vance Claflin, Kansas
