Radiolink AT9S Pro 10 Channel RC Radio Package
Includes R9DS 2.4GHz receiver and custom antenna extension. 
 
While high frequency radio waves do not penetrate water, proper installation and use of this system will offer superb control, flexibility and reliability to your submarine project. Simply remove the stock receiver antenna, clip on the supplied antenna extension, cut your new antenna to the desired length, strip the insulation from the last 1.25" and you've now got a powerful communication tool for your boat with 10 channels of control! 
 
By properly programming the integrated failsafe, loss of signal events immediately cause your boat to automatically surface, offering uninterrupted operation even if you dip your antenna under the surface of the water. 

This setup offers the highest degree of safety and reliability during operation, as you never truly lose sight of your boat while still enjoying submerged operation. 
 
DSSS&FHSS communication technology gives the AT9S Pro transmitter ultra-stable transmission signal and a control range up to 2.1 miles(3.4km) in open air! These radios support up to 15 different models, meaning you only need one transmitter for your entire fleet of subs.