A firm called AIRcable presented a new Bluetooth USB dongle that features an extended range of up to 30 kilometers (18.6 miles) with a special antenna! According to the specifications the default external antenna has a range of only 1 kilometer but that's still pretty impressive if you ask me.
The AIRcable Host XR, equipped with an extremely-powerful, highly-sensitive Bluetooth transmitter, can achieve an unparalleled range of up to 30 km! With a 9 dBi omni-directional antenna, the extended range is up to 2 km, and with the 18 dBi directional antenna, it is up to 10 km. Additionally, given its high sensitivity, it can extend the range of weaker Bluetooth devices like cell phones and headsets by hundreds of meters. With most other devices only capable of obtaining a range of 10 meters or less, no other Bluetooth device comes even close. Plus, this long-range Bluetooth transmitter connects to any computer with a Bluetooth connection and can handle virtually any Bluetooth profile available. Uses include standard data, streaming data, headsets communication (like Skype calls), and stereo headphone communication, amongst others.