Not sure what you mean by "extreme range", but most people here lean towards the Alfa flat panel antennas. They are direct replacement for the stock antennas, cost about $20, and increase range by about 50%...that numbers seems to vary widely though. There is a very good sticky on here relating to antennas...https://3drpilots.com/threads/basic-guide-to-solo-antennas-stock-alfa-fpvlr.8078/