Is there a way to protect your signal?
Signal integrity is a full area of electrical engineering and signal engineering.
A few examples :


To protect a propagating signal in free-space you can emit it louder (=more transmitting power, hence increasing signal to noise ratio (SNR)). 
Numerical transmissions often include error correcting codes.
To protect propagating signals in cables, most of them are electromagnetically shielded.


I may detail my answer according to what you want to know exactly.