I'm currently using an omni that has the elevation profile shown in the image. The maximum signal is between 0 and -10 degrees from the horizontal. For the distances between nodes this 5 degree down angle is problematic. It would be ideal if this were exactly 0. I'm having trouble find a an antenna in the 8 - 12 dBi range that radiates horizontal. Can someone recommend a product? -mikeu
You did not say which band you want to use.
If it is 2.4 GHz then I can suggest the L-Com HG2410DPU
http://www.l-com.com/wireless-antenna-24-ghz-10-dbi-dual-polarity-omnidirectional-mimo-80211n-antenna-n-female-connectors
Other suggestions would be welcome as I'm shopping around.
-mikeu
I have one for 5GHz at 250ft AGL. It isn't that great at ground level close within 0.5 miles, but at that range I still have plenty of SNR so no real-world problems.