A mag mount antenna, couldn't be hard to rig something up. People figure out ways to put mobile antennas on bicycles so a moto should be easier having steel and internal combustion.
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"To live is to suffer, to survive is to find some meaning in the suffering." -- Friedrich Nietzsche