During a routine analysis of whistlers on the wide-band VLF recording of the DEMETER satellite. a specific signal structure of numerous fractional-hop whistlers. termed the "Spiky Whistler" (SpW) was identified. These signals appear to be composed of a conventional whistler combined by the compound mode-patterns of guided wave propagation. https://www.roneverhart.com/Plastic-Jigger-with-Measuring-Lines-Box-of-12/