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Dbi Wireless

February 13th, 2011

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wifi antenna question?

Today received my wifi antennna 20 dbi bought from ebay. Got hooked up to my wireless card and very dissapointed with results. It doesnt pickup wifi signals as expected, very week power. My old 2dbi antenna does a better job than this crap..Its the antenna completely crap, or do i need amplifier?

antenna i bought
http://cgi.ebay.com/20-dBi-WIRELESS-WIFI-ANTENNA-BOOSTER-WLAN-RP-SMA-PLUG-/190510994972?pt=LH_DefaultDomain_0&hash=item2c5b57161c

http://cgi.ebay.com/20-dBi-WIRELESS-WIFI-ANTENNA-BOOSTER-WLAN-RP-SMA-PLUG-/190510994972?pt=LH_DefaultDomain_0&hash=item2c5b57161c

The stated frequency is 1970-2170 MHZ, where-as official WiFi 802.11 frequencies are 2.4000–2.4835 GHz - which means your antenna is 300MHz too low to start with and so will not be "tuned" appropriately.

Also consider the best made Cantennas (highly directional and tuned WiFi antennas) only come close to 20dB gains, often closer to 15dB in real-world testing. Your antenna is omni-directional.The eBay page does say "max 20dBi" as though that's a theoretical possibility (perhaps when used in the lower frequency range stated).

Searching online to find what an omnidirectional WiFi antenna should be capable of and most reputable online stores are selling just 7dB up to 9dB gain antennas.

Overall I think you've been mis-sold on this item, not least the fact the frequency base for it is well off.

Find Dbi Wireless On eBay Below:

24GHz 9dbi Wifi Antenna with RP SMA male Connector for Wireless Router+IPX
24GHz 9dbi Wifi Antenna with RP SMA male Connector for Wireless Router+IPX
$4.99
ZAPO W97 5DB Bluetooth 41 58G 24G Adapter 1200Mbps 5dbi Aerial Network CardXK
ZAPO W97 5DB Bluetooth 41 58G 24G Adapter 1200Mbps 5dbi Aerial Network CardXK
$13.97
ZAPO W97 2DB 58G 24G WIFI Adapter 1200Mbps Adapter 2dbi Aerial Network CardXK
ZAPO W97 2DB 58G 24G WIFI Adapter 1200Mbps Adapter 2dbi Aerial Network CardXK
$13.97
ZAPO W97L 2DB 58G 24G WIFI Adapter 1200Mbps Adapter 2dbi Aerial Network CardXK
ZAPO W97L 2DB 58G 24G WIFI Adapter 1200Mbps Adapter 2dbi Aerial Network CardXK
$13.97
ZAPO W97L 5DB 1200Mbps 24G 58G Dual Bands 5dbi Aerial Wireless Network Card XK
ZAPO W97L 5DB 1200Mbps 24G 58G Dual Bands 5dbi Aerial Wireless Network Card XK
$20.91
9dBi 24GHz Wifi Wireless Yagi RP SMA Connector Directional Antenna Cable
9dBi 24GHz Wifi Wireless Yagi RP SMA Connector Directional Antenna Cable
$8.51
1200Mbps Dual Band 24G 58GHz 2 Antenna 5dbi Wireless USB Wifi USB30 Adapter
1200Mbps Dual Band 24G 58GHz 2 Antenna 5dbi Wireless USB Wifi USB30 Adapter
$11.99
MT 484032 NH MTI Wireless 49 5875GHz SECTOR ANTENNA V POL 90 degree 16dBi
MT 484032 NH MTI Wireless 49 5875GHz SECTOR ANTENNA V POL 90 degree 16dBi
$90.00
Alfa 1000mW 80211g n High Gain USB Wireless G N Long Rang WiFi Network Adapter
Alfa 1000mW 80211g n High Gain USB Wireless G N Long Rang WiFi Network Adapter
$29.99
Kasda Networks Wireless N 300Mbps Wireless Router with 2x Internal 3dBi Antennas
Kasda Networks Wireless N 300Mbps Wireless Router with 2x Internal 3dBi Antennas
$25.49
Atheros AR9271 150Mbps WiFi MINI Wireless USB WLAN Adapter Dongle With 2DBi Ant
Atheros AR9271 150Mbps WiFi MINI Wireless USB WLAN Adapter Dongle With 2DBi Ant
$14.16
24GHz 3dBi Booster Omni WIFI Antenna WLAN SMA male plug for wireless router
24GHz 3dBi Booster Omni WIFI Antenna WLAN SMA male plug for wireless router
$2.53
Antenna 24GHz 5dBi Omni WIFI SMA Male f Wireless D link Linksys Booster Router
Antenna 24GHz 5dBi Omni WIFI SMA Male f Wireless D link Linksys Booster Router
$3.14
2Pcs 24GHz 15dBi Wireless WIFI Booster Amplifier Router Antenna Network SMA
2Pcs 24GHz 15dBi Wireless WIFI Booster Amplifier Router Antenna Network SMA
$8.04
24GHz 9dBi Omni WiFi Antenna for BNC male Wireless LAN CARD AP 2m cable RG174
24GHz 9dBi Omni WiFi Antenna for BNC male Wireless LAN CARD AP 2m cable RG174
$13.49
2pcs 3dBi GSM Omni Antenna 900 1800MHz SMA Plug Tilt Swivel for wireless router
2pcs 3dBi GSM Omni Antenna 900 1800MHz SMA Plug Tilt Swivel for wireless router
$9.15
TRENDnet 10dBi Wireless N300 Bridge
TRENDnet 10dBi Wireless N300 Bridge
$60.00
1200Mbps Wireless USB WiFi Adapter Dual Band 80211AC 5dBi 5GHz Win Linux Mac
1200Mbps Wireless USB WiFi Adapter Dual Band 80211AC 5dBi 5GHz Win Linux Mac
$22.99
600Mbps USB 20 Wifi Router Wireless Adapter Network LAN Card w 5dBI Antenna
600Mbps USB 20 Wifi Router Wireless Adapter Network LAN Card w 5dBI Antenna
$4.25
600M USB 20 Wifi Router Wireless Adapter Network LAN Card w 5dBI Antenna f F8s
600M USB 20 Wifi Router Wireless Adapter Network LAN Card w 5dBI Antenna f F8s
$4.16
24GHz 13dBi High Gain RP SMA Antenna Wlan Booster+ Cable For Wireless IP Camera
24GHz 13dBi High Gain RP SMA Antenna Wlan Booster+ Cable For Wireless IP Camera
$19.99
2 pcs 2dBi RP SMA WiFi Antenna for Wireless LAN Router Frequency 2400 2500MHz
2 pcs 2dBi RP SMA WiFi Antenna for Wireless LAN Router Frequency 2400 2500MHz
$1.59
Wavlink WS WN529R2P 300Mbps 4 Aerials 4x5dbi WIFI Wireless Routers Repetidor XK
Wavlink WS WN529R2P 300Mbps 4 Aerials 4x5dbi WIFI Wireless Routers Repetidor XK
$22.54
Wavlink WN521R2P 300Mbps Wifi Router 4x5dBi Wireless Wifi Repeater APP ControlXK
Wavlink WN521R2P 300Mbps Wifi Router 4x5dBi Wireless Wifi Repeater APP ControlXK
$30.69
2pcs 4G Wifi Wireless Broadband Amplifier Router 5dBi Antenna Signal Booster
2pcs 4G Wifi Wireless Broadband Amplifier Router 5dBi Antenna Signal Booster
$4.99
Wireless Wifi Antenna 24 ghz 14dbi Indoor Outdoor Directional Panel LIEHOU
Wireless Wifi Antenna 24 ghz 14dbi Indoor Outdoor Directional Panel LIEHOU
$56.94
9dBi ANTENNA for Actiontec Verizon FIOS MI424WR M1424WR GT784WN PK5000 Q1000 DSL
9dBi ANTENNA for Actiontec Verizon FIOS MI424WR M1424WR GT784WN PK5000 Q1000 DSL
$5.99
Intel 8260NGW Wifi 80211ac 867Mbp BT42 NGFF Card+4DBI Dual Band Antennas Set
Intel 8260NGW Wifi 80211ac 867Mbp BT42 NGFF Card+4DBI Dual Band Antennas Set
$13.29
Brand New 300mbps Wireless TRENDnet N300 Wifi Router High Power 5dBi Antennas
Brand New 300mbps Wireless TRENDnet N300 Wifi Router High Power 5dBi Antennas
$21.50
24G 58G 5G 8dbi Dual Band Wireless WiFi Router Antenna SMA Jack Male PL
24G 58G 5G 8dbi Dual Band Wireless WiFi Router Antenna SMA Jack Male PL
$2.21
Hawking Technology Hi Gain 6dBi Omni Directional Wireless b g Antenna HAI6SIA
Hawking Technology Hi Gain 6dBi Omni Directional Wireless b g Antenna HAI6SIA
$12.95
HiRO 80211ac Dual Band 11n 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
HiRO 80211ac Dual Band 11n 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
$4.99
2x HiRO 80211ac Dual Band 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
2x HiRO 80211ac Dual Band 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
$6.99
10x HiRO 80211ac Dual Band 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
10x HiRO 80211ac Dual Band 24G 11ac 5G Wireless 5GHz WiFi 5dBi Dipole Antenna
$11.99
N300 Wireless Wi Fi Router with High Power 5dBi Antennas F3IP based Bandwidth
N300 Wireless Wi Fi Router with High Power 5dBi Antennas F3IP based Bandwidth
$18.93
COMFAST 300Mbps WiFi Wireless Adapter 80211b g n 10dBi High Gain Radar Antenna
COMFAST 300Mbps WiFi Wireless Adapter 80211b g n 10dBi High Gain Radar Antenna
$18.04
24GHz SMA 7 dBi Wireless Wifi WLAN Signal Booster Antenna 5X Range Extender HI
24GHz SMA 7 dBi Wireless Wifi WLAN Signal Booster Antenna 5X Range Extender HI
$5.62
Atheros AR9271 80211n 150Mbps Wireless USB WiFi Adapter + 2x 6dBi Antenna
Atheros AR9271 80211n 150Mbps Wireless USB WiFi Adapter + 2x 6dBi Antenna
$18.80
24GHz 3dBi Omni WIFI Antenna BNC male RA 90 for Wireless Router
24GHz 3dBi Omni WIFI Antenna BNC male RA 90 for Wireless Router
$1.37

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