My buddy and I have a Sena 50 S, when he is in front of me I have to be on his tail for him to hear me clearly and if I get more that 20' from him it breaks up,  but when I get in front of him he can hear me clearly from a long distance. We can't figure out why this happens. Anybody see this or have an idea what is needed for him to hear when I am behind him, TIA