Four coax cables, two of length x, and two of length x+λ/4. For 137 MHz, the wavelength is ~218.8cm, and a quarter of that is 54.7cm.
However, everywhere I go online I see a quarter of the wavelength being ~36cm.
Eg, 2x79cm lengths and 2x115cm lengths, or 2x14.25in lengths and 2x28.5in lengths - they always come out to be ~36cm.
Am I overlooking something, or is this a case of everyone copying from an incorrect source? I'm inclined to believe I'm wrong here because I'm quite new, but I don't see how.