Motorcycle helmet intercom, best concerned for 2 bikes?? NOT for driver passenger.?

buddy and i are going on a 11 hour trip on our bikes. i was wonder what is the best intercom to use. we will each be on our own bikes, and self like one that can at least consent to us fall about 100 foot apart and still be able to talk to respectively other. any brands or suggestions? provide me with a link rather thanks!
Answers:
I've used a chatterbox x2 for 3 years now.. it have a 2 mile range. works well, however the VOX side never has been any well brought-up. Push to talk works great.
"chatterbox" brand is pretty good. I've see some good sets ah Dennis Kirk or J&P cycle (both online)

Related Questions:
  • Whats the best suspension?
  • More puppy caution.?
  • Hair product; what are some suitable brands?
  • What is a perfect flat iron to use for long curvilinear quill?
  • How much does contact cost?
  • What's the best brand for auditory guitars, within your judgment?