This allows for interchangeability of whip depending on the operating conditions and application, shorter lengths with lower gain for hilly terrain and longer lengths with higher gain for travelling on open roads with flat terrain. These antennas are a popular choice for 4WD enthusiasts hitting tough tracks or rugged touring. The AE4707B features a 2.1 dBi gain and uses our medium-duty barrel spring. This allows fitment of the AW4702B 6.6dBi whip providing flexibility and options in gain needed when travelling the varying terrain found throughout the Australian outback. Is the GME AE4707B Antenna Right for me? Alongside considerations of Installation requirements, you need to consider the Gain Rating of your Antenna and how it will impact your use. The GME AE4707B Antenna is a unity gain (2.1dBi) that outputs a signal at the same level at which it is input. The broad distribution pattern of unity gain antennas is less likely to be obstructed by buildings, bushland and hilly terrain. Therefore, a unity gain antenna is the best choice for a rugged and mountainous country.