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Thread: Looking for the best long range antenna out there!

  1. #21
    My life is this forum Barry's Avatar
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    Default Re: Looking for the best long range antenna out there!

    Quote Originally Posted by hypervista View Post


    (it looks like a lot of db loss in all those connectors!)
    There is no freaking way that works very well.

    Quote Originally Posted by StreaM View Post
    I have a few more questions.
    Keep in mine I'm new the this. I want to be 100% of knowing what your meaning.

    On the quotes can you explane what transmission means? Where exactly do I but the booster? You said both sides so I'm guessing I would need 2 booster? What booster would you recommend?

    Also with the 2.4 GHz Parabolic Grid Antenna, 24 dBi on the site you shown me it cost $124. I searched around and found it on amazon around $52.99 Are these the same?

    Check out this kit

    I probable should of looked at that before I order my alfa's

    Again Thank you for the time you been using to help me out.

    Thanks also goes out to the other.
    Boosters(amplifiers) are evil and should never be used unless absolutely necessary.

  2. #22
    Just burned his ISO StreaM's Avatar
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    Lightbulb Re: Looking for the best long range antenna out there!

    Quote Originally Posted by Barry View Post
    There is no freaking way that works very well.


    I was thinking of the same. Look out the window. He is in a valley/Mountains. Plus it's probably not even hooked up. When looking at the computer it looks like it as a WIFI adapter hooked up to it on the side. Also I see some type of dish on the right ride of the photo.



    Boosters(amplifiers) are evil and should never be used unless absolutely necessary.
    Why would you say this? because of the wattage? Most computers run on 300W. If I do get one I think it should be out site next to the antenna. Can you explane why they are evil?

    Thank You for the respond.

  3. #23
    Just burned his ISO
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    Default Re: Looking for the best long range antenna out there!

    Hello.

    "Best antenna" needs a little explanation.

    The question "best for what" jumps to mind.

    There are a few things to consider.

    1. Do you mean antenna alone, or antenna AND USB network adapter?
    2. Directional vs. omni-directional?
    3. Portable or permanent mount?
    4. Discrete or Big & Ugly?

    Let me give you my quick answer, and then lets look a little deeper.


    For a point to point link connecting to buildings up to 1 km away I like my 16 element YAGI
    I bought the USB network adapter AND antenna for $22 on ebay
    - 45dBm A Novel WiFi Kits[USB Booster&18dbi Yagi Antenna] on eBay.ca (item 170493123326 end time 02-Jun-10 13:46:09 EDT)

    For war driving in the city I like a standard (dipole) antenna with a magnetic base. They are under $5 on ebay. Since this question is in the backtrack forms I assume you are doing penetration testing.

    Now for some details . . .

    1. Do you mean antenna alone, or antenna AND USB network adapter?

    Some people refer (incorrectly) to a USB network adapter AND antenna just as the antenna.
    A good (high power) USB adapter will increase your transmit power AND receive sensitivity.
    Then if you add a "high gain" antenna you can get a huge increase in performance.

    The combination of GSky adapter and YAGI antenna listed above takes me from a 20% signal to an 85% signal in our point to point network.


    2. Directional vs. omni-directional?
    Wireless antennas like you see on most routers are omnidirectional.
    They radiate a signal in all directions.
    If you want a better signal (and you know where it is coming from)
    you can use a directional antenna pointed at your source.
    This gives better signal AND less noise.

    For war driving you usually want omni-directional (all directions)
    For connecting with a weak signal you want a very directional antenna lined up perfectly.

    The most directional antennas usually have a deflector dish (like a satellite dish) behind them.
    These can make connections over 100 km away with a clear line of sight.
    These are a little hard to hide if you are trying to sneak in to a network.

    I like the Yagi antenna (16 - 18 Dbi) for a longer range link.

    Flat panel or biquad antennas are a little less directional but give a good signal boost.

    "mast" or "stick" antennas pick up signals in all directions (less range)
    I keep one like this in my laptop bag.
    WIFI 2.4GHZ 7DBI BOOSTER ANTENNA SMA RP WIRELESS WLAN on eBay.ca (item 380238276567 end time 02-Jun-10 09:14:45 EDT)

    3. Portable or permanent mount?

    If you want to improve signal from your own router or AP there are many tricks to help.
    Make sure you have a clear line of site.
    Put the correct (directional) antenna on your AP and computer.
    Aim them well


    If you want to get the most signals as you drive through town.
    Get a good USB adapter.
    Get a good antenna with a magnetic mount that will stick to the roof of your car.

    4. Discrete or Big & Ugly?
    YAGI is a big ugly and effective antenna.
    BiQuad or flat panel are not so ugly and almost as effective.
    Dipole (stick) antennas are more discrete.


    REMEMBER - Antenna rating is in DBI
    Every 3 DBI effectively doubles the range from which you can pick up signals.

    Remember - you can change the antenna on your router / access point and on your computer.
    This will greatly improve your connection.

    For example, if you have a 2 dbi antenna on your wireless card, switching just the antenna can give you a huge gain in range, reliability and performance.

    I switched to a 9 Dbi antenna on my AP and now transmit a more powerful signal (4x better range) WARNING!! - the longer range you transmit the more opportunity you give hackers to find and use your system.


    Transmit power is rated in Dbm (milliwatts)
    A standard wireless network card might have 50 mw power
    Some of the high end USB network adapters have 1500 mw of power.
    This improves the signal to noise ratio (SNR) by overpowering your signal compared to the noise around you. (like microwave ovens and 2.4 ghz cordless phones)

    Combine a high gain network adapter and a high gain antenna and get a huge jump in signal strength.

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