On Sun, 23 Nov 2008 19:26:58 -0800 (PST), JIMMIE
wrote:

On Nov 23, 7:39*pm, Jeff Liebermann wrote:
On Sun, 23 Nov 2008 15:32:02 -0800, Jeff Liebermann
wrote:

NEC2 model:
http://802.11junk.com/jeffl/antennas/AMOS-7/
http://802.11junk.com/jeffl/antennas/AMOS-5/ *(not optimized yet)

Fixed. *I was feeling guilty so I ran it through the optimizer in
4NEC2. *I haven't built a 5 dipole AMOS yet using these dimensions.

I put one up I use with a WiFi repeater and I can see dozens of
wirless routers in my neighborhood. The antena i mounted at about
20ft on my chimney. There are about 8 or 9 with no security. If I so
chose I would never have to pay for internet service. There is another
subdivsion behind my house I havent even looked at that one yet.

If stealing internet service from the neighbors is your intended
purpose, you selected the wrong type of antenna. A sector antenna may
be a great idea for running a WISP or central access point, where
you're never sure of the direction the client radios are coming from.
It's a bad idea for use at the client end. The idea is to pickup as
little interference as possible. You're reception of 9 stations is a
problem as any one of these could provide sufficient interference to
make your pirated internet connection useless. I suggest you look
into a panel or dish antenna, which will provide a much narrower
horizontal beamwidth, with the added bonus of more antenna gain.

Strange thing I know 3 of the people who have the open systems and
they are farly savy about these things. I wonder if they are leaving
them open on purpose.

I was running an open access point at my office for a while. However,
I was also monitoring connection attempts and traffic. I figured that
nobody would bother. Wrong. I had some bum in a pickup truck and
camper, connect regularly to make VoIP phone calls. I had no problem
with him using the system and we eventually came to an arrangement.
However, he stupidly told all his friends, who immediately abused the
system, so I locked it up with a WPA password.

In another incident, one of my customers was in a hotel that wanted
real money to use their Wi-Fi. (This was about 6 years ago, before
the widespread proliferation of free Wi-Fi service). So, he connected
to a random open access point. The security on his laptop was more
than a little lacking (writable shared folders), resulting in the
installation of multiple trojan horses, spam bots, etc. I suspect the
open access point was an intentional trap set for hotel visitors.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558