This is what KO America told me when I enquired:
407 - regular copper stranded wire antenna
408 - coaxial antenna for better range (discontinued)
409 - coaxial antenna for better range
Here is the compatibility chart from our website for the response modes
http://www.kopropo.com/america/index...127&Itemid=173
Regards,
Robert Morris
KO PROPO America
[email protected]
Tel: 310.532.9355
Not sure if you need a long antenna tube to expose more of the aerial wire on the 407. I bought a 407 for my B44 and it works just fine, no obvious differences to the 408 that came with the radio.
HTH
