This is a late 1970's early 1980's era radio controller i used with a car in the early 80's! I believe you can use it for a boat if you changed the chip last used 15 yrs ago and dry stored the battery pack has a broken tab needs to be glued, as we hv the pc that broke off...
The antennae extends, however it does over extend and the top portion removes.. Other than that its a good old vintage pc of radio control history! It worked fine the last time it was used dry stored since in my dry basment. Might need cleaning perfect display pc of the early vintage days of rc.