I found these J Poles cut for MURS & MURS/FRS which some might find useful. The Arrow Satellite antenna that I have is a quality product, so I'm sure this is just as nice:
MURS only:
http://www.arrowantennas.com/murs.html
MURS/GMRS-FRS (scroll down)
Arrow Antenna J-Poles
MURS only:
http://www.arrowantennas.com/murs.html
MURS/GMRS-FRS (scroll down)
Arrow Antenna J-Poles