They can, but they lose their certification. Same if you don't use a certified board your antenna might need new certification of your device. It may work, but

They can, but they lose their certification. Same if you don't use a certified board your antenna might need new certification of your device. It may work, but if authorities find out it may become quite expensive. I can also remove my lights and breaks from my car and it will still work, but if authorities find out I might be in trouble.