signal drop

I have a phantom 4 and it is all up to date with its soft ware but i am getting broken video trans and the display keeps saying "signal lost" its driving me nuts and i cant find a fix anywhere. does anyone have a fix !!

Let me preface by saying I am still a novice pilot. The phantom 3 Standard is my first drone and I've been flying it for a little over a month. Living in West Virginia I noticed a pretty limited range with the stock antenna. I can only assume this is due to the mountainous region. I bought...