Sma Female Antenna Port - Universal Dongles Use The Less Common Mcx Or Pal Antenna Ports. Sma Is More Common, So More Adapters And Antennas Are Available For It. It Is Also More Durable And Has Lower Rf Insertion Losses. Hf Reception In Direct Sampling Mode - Listen To 100 Khz - 25 Mhz With Direct Sampling. Simply Connect An Hf Antenna To The Sma Port, And Choose The Q-branch Mode. There Is A Built In 25 Mhz Low Pass Filter, But Additional Hf Filters May Be Required For Optimal Performance (e.g. To Attenuate Strong Mw Am). Better Cooling System, Big Aluminium Case And Passive Cooling - These Units Come Stock With An Aluminium Case And Passive Cooling Via Two Cooling Fans. And The Pcb Board Is Designed Especialy For Passive Cooling Design By The Cooling Holes And Big Aluminum Enclosure. This Stops Reception Failing Due To Heat Above ~1.2 Ghz Use R820t2 Tuner, Higher Quality Passive Components, A Choke On The Usb Line To Reduce Usb Noise, A Much Improved Pcb Design For Significantly Less Internal Spurs And