what is the highest dBI signal strength for high gain antennas?

Question

using linksys

Answer 1

Do you want one that mounts to the router or an external one that connects with a cable to it. There are antennas with up to 24dbi of gain (patch type or dish type) that will connect. There are several 9dbi "rubber duck" type antennas. Many for even more gain that are inside and others for outside use.

Check some sites like http://fab-corp.com http://hyperlinktech.com etc for really good antennas.

Answer 2

High Dbi Wifi Antenna

Answer 3

For the best answers, search on this site https://shorturl.im/ax2Du

1. Your antenna dBi rating has nothing to do with distance. 2. The distance you get depends on: a) Transmitter radiated power strength b) Signal propagation attenuation between transmitter antenna and receiver antenna. c) The higher the antennas are placed, the longer distance you will get. dBi alone does not determine your distance. There are many other factors that determine your usable distance between WiFi receivers and transmitters. A higher dBi rating will only improve the distance of performance over a lower dBi rating. But, it will not guarantee any given distance at all. --------------------------------------... dBi is a reference unit of measure used to compare "antenna gain" between different types of antennae. The dBi is used to illustrate the relative performance of one type of antenna to another. The reference antenna is typically the theoretical "Isotropic" vertically polarized "omnidirectional" antenna. The isotropic antenna theoretically radiates power equally in all directions. The efficiency of other types of antennae are compared against this the isotropic reference of 0dBi. If another antenna were rated at 10 dBi, it would have a theoretical gain of 10 times that of a 0dBi antenna. However, this 10 dB gain comes at a cost of directionality, meaning that the antenna only has this amount of power gain in one focused direction. It could even have a negative gain in other directions. So, high gain antennae are usually only good for specific point-to-point, or specific direction usage. When someone quotes "range" capability of a transmitter or antenna, that again is only the best possible range under "ideal circumstances". This usually means clear line of sight between the transmitting and receiving antennae. Often this can only be achieved by mounting the antenna high up so that there is clear line of sight (no visible obstructions) between the transmitting and receiving locations.

Answer 4

I can never understand the db concept.
All know is that more is better.
I sort of had it once - db is compared to some imaginary standard and more is better

Here is a rough guide

antenna that comes on a router - 1 db
External antenna that you can buy to add to a Linksys router
( $ 50 or so) - 7 db



"Poor man's wifi usb adapter antenna" - up to 15 db

http://www.usbwifi.orcon.net.nz/

wall mounted flat panel wi fi antenna - 20 db

At 125 miles the winner must be

http://www.wifi-shootout.com/

Seems the record is now 167 miles


http://www.wifinetnews.com/archives/006518.html

Answer 5

I assume this is a 2.4Ghz Wifi you're talking about with NLoS(non line of sight). From my experience working with Altai Technologies equipments, the wifi AP using directional 19dbi reaches 800meter NLoS at max power of 25dbm. So logically, directional 21dbi may extend to 1km range NLoS. As for perfect LoS(line of sight) with no obstruction in between, we have made a success tried bridging (point-to-point) a pair of directional 12dbi with 26dbm power at a distance of 15km. wifi antenna which works up to 4 miles your friend is selling, i guess he meant LoS. Having a lower dbi receiver to capture 4miles signal, your wifi card need to have high transmitting power feature.

Answer 6

+7dBI i have seen on large wireless internet Router antennas. What equipment are you using?