Electromagnetic waves and helicopters

1- the main thing is that you have a carrier wave, which is just for e.g. a sine wave. Then with a device called a modulator, you manipulate the carrier wave, with this you will get small wavelets on the carrier wave. The two parameters you can manipulate are the amplitude (AM) or frequency (FM)(i am talking about the radio now). You can transmit this using an antenna. The reciever has a demodulator in it, which rips the information, the wavelets, off the carrier wave, and you are done...

2-Its very hard to design a flyable, airplane or helicopter. You have to make extensive calculations using the not so simple equations of aerodynamics. I suggest you read some aerodynamics textbook...