We are an events streaming company. We stream with motorbikes and such. We would like to also stream the sound around the motorbike because in sports events people cheers runners and that's cool to hear.
The problem is that the camera guy in the motorbike and the guy controlling the cameras are in constant communication, so simply adding a mic won't work because all the camera chat is also streamed, so we thought in adding 2 directional mics in the motorbike: one at each side (or simply 1 mic at the back, whatever), but the idea is to use a mic that "blocks" sounds in it's back, so camera chatting is not streamed.
Now, how is this reliable? A directional mic truly blocks the sound around it and only captures sound in front of it or simply reduces a bit the db but is still heard? We are a low budget company (just started) and can't start buying expensive mics and do testing just for nothing, so we prefer to ask professionals first.