Yes 1km is okay distance you its 0.6miles so half a mile isnt bad you are getting about 2500 to 3000 feet right? your area may have interference. I have a stock phantom 3 standard with only magic powers done to it and I fly over 7000 feet distance but I have seen phantom 3 standards fly over 11,000 distance which is 2 miles. You can even possibly reach 3miles with just a parabolic windsurfer. I have custom ones made and they direct my signal better.
Yes 2 miles to 3 miles range with magic powers and stock Phantom 3 standard there are videos.