LINKSYS HGA7S antenna this is technology of 2004.
LINKSYS this is or was, a division of
Cisco systems inc. I become aware of this magical HGA7S antenna, ten years ago, that I was up to increase range at Bluetooth radios with SMA connector.
HGA7S this is a product
of Taiwan.
This item never been priced cheaply.
SMA connector
2.4 ~ 2.5 GHz
This is an item, a product, with an
actually inspected and confirmed gain of 7dBi.

LINKSYS designed this accessory so to pair it, with High End
WiFi bridge radios, WiFi LAN networking.
Bluetooth radios they also use this antenna bandwidth, and this generated an new application compatibility.
While Bluetooth radios with SMA connector this is a rare find, this is not that rare at industrial electronics.

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Cisco-Linksys HGA7S High Gain Antenna for SMA Connectors HGA7S-EUHigh Gain Antenna for R-SMA Connectors
Increase the effective range of your wireless devices!
Increases the effective range of Linksys wireless devices
Stronger signal increases wireless coverage into hard-to-reach areas
Improves throughput by reducing retransmissions Easy installation -- simply replace your current antenna
SpecificationsPeak gain: 7 dBi
Frequency range: 2.4 GHz ~ 2.5 GHz
Voltage standing wave ratio (VSWR): 1.92 max.
Polarization: Linear vertical
Direction: Omnidirectional
Impedance: 50 ohms nominal
Connector: Reverse SMA
• WRV54G
• WMP54GS
• WMP54G
• WET54G
• WET54GS5
• AS1SMA (Antenna Stand)
HGA7S (with
R-SMA connector)