it might dry out for you , but dont have it on for a day or two , if its showing "snow on , the tv , you can replace the down lead . but its like steray said , they should have put a rain loop in the lead just as it came in to the window , so the lead ,goes down the wall  6ins past the window, and then back up into the hole in the wall/ window. so the rain can drain off the lead , and not follow it into your room ,  "get them back out  to fix it ,
                 mick
                
 November 2008