GME AE5002 2.1DBI UHF On-Glass Antenna are designed to be discreet and unobtrusive whilst delivering outstanding performance and quality. The AE5002 from GME is an Australian made on-glass antenna, pre-tuned to 477MHz and with 2.1dBi gain. It has a modest under-glass coupling box. Alongside considerations of Installation requirements, you need to consider the Gain Rating of your Antenna and how it will impact your use. The GME AE5002 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. Length 21 cm.