J Pole Antennas come in many flavors, flexible (portable) roll-up, Copper pipe, aluminum or stainless rod, single band, multi band etc. I will try to present some variations that are TRUE dual band versions instead of the typical 2 meter versions offering poor VSWR and near 0 gain as a compromise for 70cm.
Ed Fong’s roll-up j Pole is a true dual band antenna: