Getting Wifi to a building ~ 1000ft away

Discussion in 'Networking Issues' started by justin holt, Apr 28, 2008.

  1. justin holt

    justin holt LI Guru Member

    I may have asked for help from here before, but I have more information so bare with me please.

    My Boss wants to get wifi from our building (a dsl connection) to the Town Board of Education building. He wants to do this so he can avoid putting their visiters on our network and possibly opening up security issues.

    As it stands, I have a Linksys WRT54GS V5 router with the latest version of DD-WRT (which is 24 RC 7) and a WRT54G V8 with the same version of DD-WRT. (Seeing as the WRT54G V8 does not have the detachable antennas, I will probably replace this with a GL instead)

    We have two Cabletron Systems Outdoor Directional Antennas. They claim to be 14 dBi antennas that can project 11Mbit/s 3.5 miles down the road with 33 ft line of sight clearance.

    I am wondering if the claims that the manual makes about these rates are true, do you think these should be fine to use since we already have them here.

    Thank you for all your help
  2. danix71

    danix71 LI Guru Member

    Why don't you just use them??? Put'em to a try!! And take care at aiming, any directional antenna must be aim one to each other properly.
  3. HennieM

    HennieM Network Guru Member

    A 1000ft is not much. If you have near line of sight from the one antenna to the other, even if you don't clear the 2ft or so (33/5280/3.5*1000) of the 1st Freznel zone, you should be OK.
    Even if the antennas have a bad VSWR you should be OK.

    Keep the cables from router to antenna short, and use good quality cable. Alignment would be the difficult part though, so use the signal strength readings you get in DD-WRT (under Status > Wireless). If you get a reading from one to the other of about -65dB or better, with noise less than -92dB or so, you've got full signal.

    To get the best link you should probably set the one up as an AP, and the other as a client bridge. You can also set both as WDS nodes.

    If you post the exact model nos and/or links of the antennas, we could check on the specs, but that would not serve a real purpose as you already have them. If you find out afterwards that these are crappy antennas, you can swap out the actual antenna, but your masts/mounts, cables, etc. would stay.
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