hello all, i would like to fly my plane with high range but when i use some tx like avionic and flysky with 5.8GHz Circular Polarized Antenna i am getting the range about to 1km i want to fly with long range fpv, any devices to fly long range flight ?? 

If you are flying with flysky receivers then you will not get better range out of it. You need to upgrade to frsky range of transmitters and receivers. According to my knowledge frsky L9R has very long range. However it needs frsky transmitters or frsky transmitter modules such as DJT or XJT modules. These modules will only work with few transmitters such as 9X models.