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
"They say the test of literary power is whether a man can write an inscription. I say, 'Can he name a kitten?'" -- Samuel Butler