"KG0WX" wrote in message
oups.com...
I'm trying to setup a homebrew WiFi (802.11b/g) antenna for my IBM
Think Pad laptop. The coax run will be about 15" going to some home
brew antennas. I don't know the name of the antenna but it can be seen
at this url:

http://wireless.gumph.org/content/4/...s-antenna.html

I plan on running coax (2 lines) from the 802.11 card (internal mini
PCI)
to the rear top of the LCD display. I'll terminate with connectors and
attach the antennas when the laptop is open. Great plan but what about
coax losses? The output of the 802.11 card is 250mw.

Most WiFi antennas use RG174 coax - I've even seen mobile antennas
for WiFi with 10' runs of the stuff. Correct me if I'm wrong but
wouldn't
10' of rg174 at 5 ghz be so lossy that it would defeat the purpose of
the
mag mount mobile antenna?

Like I said, I only need about 15" from the output of the 802.11 card
to the antennas. What coax would be good? I'm worried about losses
but I also need to route the coax through the laptop and up the back
of the LCD display so size (dia) matters. I guess I'm stuck with RG174
but are there better choices? What would be the losses with 15" of it
into a matched load at 5ghz?

Basically, given the above conditions and with the need for both small
coax and teeny connectors, what would be your recommendations?

73's de Ken KG0WX

Hi Ken

Could you use a USB connected wireless adapter?? You can dismantel some
USB wireless adapters so their antennas are available to you for attaching a
coax and even a SMA if you have the ability to work with that small stuff.

Jerry