Un-stick the Video Transmitter, turn it 180 degree's around, so the antenna out position is opposite the Compass, and re-stick.
They mounted it backwards. Also, the cloverleaf/Circular Polarizing antenna's work best pointed exactly straight down.
I've gotten to 671 meters at 47 meters in altitude with clear reception. But, as others have pointed out, when rotating, you will likely lose reception at some point.
If/when that happens, climb. A difference of only 10 meters makes a huge difference.
Also-if you are that far away, there is no way you can see the aircraft well enough to tell which direction it's pointed and control it. So, if you lose video signal-you have a "get out of jail free" card-flip the switch to Home Lock(assume you are in GPS mode-if not, toggle GPS mode too), and just pull back on the stick, until you receive video signal again, or can see the aircraft well enough to regain control.
Also-be careful with flying out such long distances. You may end up with a loss of transmitter signal-and still have video signal(had that happen twice-long story, but the antenna I was using, was mounted in a way that it was outside the landing gear leg where the RX antenna was located, blocking that signal). IF, that happens, you will see GPS FS on your screen(assuming you have the iOSD Mini), the aircraft will stop-hover for about 5 seconds, then make a very smooth turn, and fly back to home point at about 10m/second, at the altitude it lost signal, or, 60 feet-whichever is higher.
It's happened to me twice-and both times, it flew back perfectly. I've since removed that longer antenna I had on and replaced with a shorter one that has a 90 degree connector on it-no problems at all.
EDIT: forgot-I have a Boscam 600mw transmitter, and a dual antenna/7" screen receiver. All have circular polarizing antenna's. The Boscam actually only puts out about 200 or so MW's according to some online tests-but it works well enough for me. Looks like you have the identical video transmitter that I have.
Use double sided, 3M Red sticky tape(2 pieces-1 on the TX and 1 on the back of the Phantom), to stick it.