This article covers Alfa 802.11g 9dBi TNC ハイパワー (9dBi) ねじ込み式 無指向 ブースターアンテナ。ルータおよびネットワークカードアダプタ用。Linksys WRT54G.

Overview

The Alfa 802.11g 9dBi TNC High-Power Antenna is an omnidirectional booster designed to extend the range and improve the signal strength of 2.4 GHz Wi-Fi networks. With a gain of 9 dBi, it can increase coverage by up to 300% and signal strength by up to 400% compared to standard built-in antennas.
This antenna uses a TNC screw-type connector, making it compatible with many legacy routers and network adapters such as the Linksys WRT54G series and WAP54G. Installation is tool-free: simply twist off the existing antenna and screw on this one. No configuration or software changes are needed.

Connectivity & Compatibility

  • Connector: TNC male (screw-on)
  • Frequency: 2.4 GHz (802.11b/g/n)
  • Compatible devices: Routers, access points, and wireless cards with TNC antenna ports. Examples include Linksys WRT54G, WRT54GL, WAP54G, BEFW11S4, WSB24, and others.
  • Pattern: Omnidirectional (360°), no aiming required.
  • Installation: Twist off existing antenna, screw on this unit.

Product Info

This antenna is sold by Alfa and available on Japanese online retailers for approximately ¥9,930. It comes with a lifetime warranty against defects. Market positioning is entry to mid-range, offering a cost-effective way to improve Wi-Fi coverage without replacing the entire router. No additional accessories are included; the antenna itself is all you need.

Best Use Cases

  • Home users with dead zones: Replace your router's antenna to reach upstairs rooms or far corners. Ideal for apartments or houses where adding a repeater is inconvenient.
  • Extending the life of older routers: If you still use a TNC-equipped router like the Linksys WRT54G, swapping antennas can rejuvenate its performance at a fraction of the cost of a new router.
  • Workshops or garages: The high gain helps penetrate walls and obstacles, providing a stable connection in challenging indoor environments. Note: not weatherproof, so keep it indoors or under cover.
    Not recommended for users who need 5 GHz (802.11ac/ax) performance or those with RP-SMA connectors, as this antenna is strictly 2.4 GHz with TNC interface.

Product Disclosure (Amazon)

  • Manufacturer: ALFA
  • Brand: Alfa
  • Seller: FK MIKANEX IMPORT
  • Fulfilled by: FK MIKANEX IMPORT
  • ASIN: B009H028CM
  • Note: This article covers a manufacturer-made product based on Amazon listing details.