Help 15dbi omni, No performance gain

I bought a 15dbi omni directional Dlink wifi antenna. I have DWL-2100AP.

Now I want wireless access throughout my home.

I mounted this antenna on roof (single story house), 30feet above ground on a pole. I ran LMR400 Low Loss cable, and a pig tail between antenna and this AP. Even with such a high gain antenna, the performance was no better than with it's factory 2dbi antenna. Checked the cables, connectors and connections all seem fine. Any ideas why?

With line of sight, the range isn't any greater than 40feet from antenna. The AP is located indoor, the antenna mounted on roof exposed. Within house I didn't see any difference between 2dbi and 15dbi.

Indoor, it doen't work more than 35feet from antenna. As said, this is similar result to 2dbi factory omni antenna.

Please help!

Should the center conductor of N connector (the connector that is on the antenna) be short with outer part of connector?

I am reading a resistance of 1ohm.

Anyone who can guide me to a forum that would answer my question?

If you omni is 30 feet above the ground maybe your signal is above you. Remember that high gain antennas focus the signal into a more narrow plane and your omni is sending the signal out as a horizontal pancake shape. Have you tried it further away with line of sight? Try the antenna at ground level with just the pigtail. We have a 15dbi omni and it can connect with a laptop with internal wifi at 1km. Hope this helps

Good to see a reply.

Lyndon:

I connected this 15dbi antenna directly to the pigtail. The pigtail uses LMR200 1.5feet cable with quality N connector and RP-SMA.

I kept the antenna on desk such that the tip of antenna got support from wall to stand vertical [I assume this was wrong way however], still same signal quality.

Noticed one thing, the signal is stronger when I move my laptop closer to AP or pigtail. Much stronger than I move it cloes to 15dbi omni.

Replaced the pigtail, same result.

Has it something to do with antenna diversity? I hacked this DWL-2100AP and noticed one PCB antenna (my guess, horizontally polarized) and another one is this external antenna. A diversity switch is located, too, just before the traces of these antennas.

However, there is no option offered by dlink to switch between antenna.

Also, some claim that this antenna is not meant for DWL-2100AP. Unless otherwise, I claim it to be utter bull. Because, this antenna is supported by DWL-2000AP as per antenna specs, and their is NO difference between 2000 and 2100 except that 2100 is it's sucessor.