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Omni Aerial

September 24th, 2007

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how far is 2 dbi?

How far is it. And also , when you buy routers, usually how many dbi are the antennas?

Antenna gain in decibels (logarithmic form) and relative to isotropic "perfect antenna [dBi]. NB: Distance is inversely relative to frequency. Gain is basically how "Loud" the signal is , thus a combination of both frequency and gain.

PS: not all antenna are "perfect" and thus gain relative to a dipole (omni aerial which is similar to your car antenna in shape) is more common.

Find Omni Aerial On eBay Below:

1PC 868M 900M 915Mhz antenna module aerial 5dbi Omni direction SMA male
1PC 868M 900M 915Mhz antenna module aerial 5dbi Omni direction SMA male
$0.99
WiFi GSM 3G 4G LTE Antenna 700 2800Mhz Omni Aerial 3dBi with SMA adapter cable
WiFi GSM 3G 4G LTE Antenna 700 2800Mhz Omni Aerial 3dBi with SMA adapter cable
$6.79
2pcsSMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction
2pcsSMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction
$1.73
868MHz 900MHz 915MHz RFID ZigBee SMA Male Connector Omni Antenna Aerial
868MHz 900MHz 915MHz RFID ZigBee SMA Male Connector Omni Antenna Aerial
$2.32
2 Pack 868MHz 915MHz ZigBee Smart Home RFID 3dBi Omni Antenna SMA Male Aerial
2 Pack 868MHz 915MHz ZigBee Smart Home RFID 3dBi Omni Antenna SMA Male Aerial
$7.65
868MHz 900MHz 915MHz RFID ZigBee Omni Antenna Aerial with SMA Male Connector
868MHz 900MHz 915MHz RFID ZigBee Omni Antenna Aerial with SMA Male Connector
$2.37
868MHz 915MHz RFID ZigBee 3dBi Omni Antenna RP SMA Aerial for Smart Home Control
868MHz 915MHz RFID ZigBee 3dBi Omni Antenna RP SMA Aerial for Smart Home Control
$4.48
2pcs Antenna 24GHZ 2dBi 20cm RG178 cable omni Wireless WiFi aerial core
2pcs Antenna 24GHZ 2dBi 20cm RG178 cable omni Wireless WiFi aerial core
$5.00
1X 24Ghz 2DBI WIFI antenna OMNI RP SMA male ST bluetooth aerial 5cm long NEW
1X 24Ghz 2DBI WIFI antenna OMNI RP SMA male ST bluetooth aerial 5cm long NEW
$0.99
Boat Paddle Antenna Glue Rod Aerial 8DB Folding High Gain Foldable Omni
Boat Paddle Antenna Glue Rod Aerial 8DB Folding High Gain Foldable Omni
$3.28
9DBI WiFi Magnetic Base Omni Antenna Aerial SMA 24GHz D4Z5
9DBI WiFi Magnetic Base Omni Antenna Aerial SMA 24GHz D4Z5
$4.40
WiFi Antenna 24Ghz 58ghz Omni Dual Band 5dbi Aerial RP SMA Male with Mini 113
WiFi Antenna 24Ghz 58ghz Omni Dual Band 5dbi Aerial RP SMA Male with Mini 113
$7.01
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direc
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direc
$1.73
24Ghz 5dBi WiFi Antenna Wireless Network Aerial Omni Open Cover 113 Cable
24Ghz 5dBi WiFi Antenna Wireless Network Aerial Omni Open Cover 113 Cable
$2.65
3G Antenna Rubber 6dBi 850 900 1800 1900 2100MHZ SMA male OMNI aerial 200mm long
3G Antenna Rubber 6dBi 850 900 1800 1900 2100MHZ SMA male OMNI aerial 200mm long
$3.47
GSM 3G GPRS CDMA Antenna aerial 3dbi omni SMA male connector 110mm folding NEW
GSM 3G GPRS CDMA Antenna aerial 3dbi omni SMA male connector 110mm folding NEW
$2.43
3G Antennas 800 900 1800 1900 2100MHZ 3dBi GSM aerial SMA Male Omni aerial 1
3G Antennas 800 900 1800 1900 2100MHZ 3dBi GSM aerial SMA Male Omni aerial 1
$2.77
3G Antennas 800 900 1800 1900 2100MHZ 3dBi GSM aerial SMA Male Omni aerial 1
3G Antennas 800 900 1800 1900 2100MHZ 3dBi GSM aerial SMA Male Omni aerial 1
$4.69
LTE 4G 700 2700Mhz antenna 5dbi OMNI RP SMA male oars flat aerial signal booster
LTE 4G 700 2700Mhz antenna 5dbi OMNI RP SMA male oars flat aerial signal booster
$5.63
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction+
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction+
$1.84
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router DirectiJB
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router DirectiJB
$2.53
1PC 433Mhz GSM antenna 3dBi RP SMA rotatable OMNI radio aerial black 110mm long
1PC 433Mhz GSM antenna 3dBi RP SMA rotatable OMNI radio aerial black 110mm long
$3.34
24GHz Wireless Module Antenna 3cm Omni RP SMA Male Aerial Router Small Copper
24GHz Wireless Module Antenna 3cm Omni RP SMA Male Aerial Router Small Copper
$3.28
433Mhz antenna OMNI FPC soft PCB aerial patch 3060mm with IPEX connector New
433Mhz antenna OMNI FPC soft PCB aerial patch 3060mm with IPEX connector New
$2.81
2PCS 433Mhz 3dbi OMNI antenna SMA male straight rubber duck aerial FPV RC 2
2PCS 433Mhz 3dbi OMNI antenna SMA male straight rubber duck aerial FPV RC 2
$3.19
Mobile Broadband Antenna Aerial Booster LTE 4G 15M Huawei E5172 Boat Motorhome
Mobile Broadband Antenna Aerial Booster LTE 4G 15M Huawei E5172 Boat Motorhome
$200.94
WIFI Antenna 24Ghz 58ghz Omni dual band 5dbi Aerial RP SMA male + Mini 113 PC
WIFI Antenna 24Ghz 58ghz Omni dual band 5dbi Aerial RP SMA male + Mini 113 PC
$8.87
433Mhz antenna 12dbi high OMNI rubber radio aerial 220mm with SMA male connetor
433Mhz antenna 12dbi high OMNI rubber radio aerial 220mm with SMA male connetor
$6.57
SuperLinxs 5GHz 8dBi Omni Antenna Aerial 58 53 V Pol Outdoor N 80211ac n
SuperLinxs 5GHz 8dBi Omni Antenna Aerial 58 53 V Pol Outdoor N 80211ac n
$39.00
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direct ESU
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direct ESU
$1.70
WiFi Antenna 24Ghz 58ghz Omni Dual Band 5dbi Aerial RP SMA Male with Mini 113
WiFi Antenna 24Ghz 58ghz Omni Dual Band 5dbi Aerial RP SMA Male with Mini 113
$7.15
35dbi 868Mhz Antenna SMA Male Omni Directional 1M for Ham Radio Booster aerial
35dbi 868Mhz Antenna SMA Male Omni Directional 1M for Ham Radio Booster aerial
$3.45
433Mhz 3dbi antenna DTU cabinet aerial OMNI waterproof with 12m extension cable
433Mhz 3dbi antenna DTU cabinet aerial OMNI waterproof with 12m extension cable
$6.57
WiFi Outdoor 24Ghz Omni Antenna Aerial Signal Booster Caravan Boat Marina 14dBi
WiFi Outdoor 24Ghz Omni Antenna Aerial Signal Booster Caravan Boat Marina 14dBi
$41.35
Mobile Broadband Antenna Aerial Booster LTE 4G 15M Huawei E5172 Boat Motorhome
Mobile Broadband Antenna Aerial Booster LTE 4G 15M Huawei E5172 Boat Motorhome
$201.21
WiFi Outdoor 24Ghz Omni Antenna Aerial Signal Booster USB Boat Caravan Marina
WiFi Outdoor 24Ghz Omni Antenna Aerial Signal Booster USB Boat Caravan Marina
$62.66
Mobile Broadband Omni Antenna Boat Huawei Aerial Booster B970 B683 B260A E5172
Mobile Broadband Omni Antenna Boat Huawei Aerial Booster B970 B683 B260A E5172
$61.40
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni Router Direction
$2.57
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni RouterDirectionS
2pcs SMA Male WiFi Antenna Module Aerial 3dbi 868m 915mhz Omni RouterDirectionS
$1.80

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