Question : How long of a cable and what type do I need to extend my wireless signal?

I'm using a D-Link DWL-G700AP.  I've chosen a Hawking HAO14SDP antenna.  My question is, how long of a cable must I install before I begin to lose signal strength? I need it to be 50'.  Thanks.

Answer : How long of a cable and what type do I need to extend my wireless signal?

The signal strength loss on a good quality co-ax antenna cable like a LMR-400 is 6.8db/100ft, so for a 50 ft length you woudl lose 3.4db. (versus the 30 ft kit they have, which I don't see the spec on - the picture does look like a 400 size cable - if so, then approx 2dB loss). You also need to add in the losses for the approx 3ft pigtail (3 ft of LMR-195 pigtail cable =0.5dB loss), and each connector (about 0.5 dB each). The main drawback of long antenna cable runs is the cost of the cable, so the closer the antenna is to the "box"  the better: there is essentially no loss over the ethernet cat 5 cable.

Here's one table of attenuation for each type, gleaned from
   http://www.timesmicrowave.com/cgi-bin/calculate, Andrew's product guide
   (http://www.andrew.com), Belden (http://www.belden.com), and a couple of
   other sources.  Remember, less is better (zero is ideal!)
   
   Cable             Outer                 Loss in db/100'
   Type            Diameter                 (at 2.5Ghz)
   ----------------------------------------------------------------------

   LMR-200            0.195"                  16.87
   LMR-400            0.405"                  6.76
   LMR-600            0.509"                  4.42
   LMR-900            0.870"                  2.98
   LMR-1200            1.200"                  2.26

   Belden 9913      0.405"                  8.15
   Belden 9914      0.405"                  ???

   LDF1-50            0.250"                  6.14
   LDF4-50A            0.500"                  3.91
   LDF4.5-50            0.625"                  3.72
   LDF5-50A            0.875"                  2.27
   LDF6-50            1.250"                  1.68
   LDF7-50A            1.625"                  1.44

   For Times Microwave's big cable comparison chart, go here:
   http://www.timesmicrowave.com/cgi-bin/byteserver/products/commercial/selectguide/LMRGuide.pdf

Take a look at this site for connectors, cable etc. http://www.l-com.com/content/hyperlinkbrand.html

The 150 ft outside is not a problem, unless there aree obstacles - NB the water in leaves does reduce signal strenght of the 2.4GHz signal significantly. a thin layer of vinyl is not a problem. The brick may be a little problem - especially if you also have other internal walls of concrete and rebar.