So I'm recently L2 certified. I got my first carbon fiber kit which I'm very excited about, my intention was to build my first mach-buster and I figured carbon fiber was a good way to go. I have a telemetrum altimeter/tracker and their instructions suggest that carbon fiber is radio-opaque, it is a radio and GPS device. I'm sure there are people here that have experience with this. Is there any way I can still use this device without any external antennae? I've never used the telemetrum before in a carbon fiber rocket, but I worry that if I need external wires/antennae it may be difficult to achieve a mach-busting flight. Is there any way around this? Is carbon fiber really radio opaque? My club doesn't allow launches over 3000' without a tracker, am I doomed to have an external wire on my rocket? Thanks.