I found this cool antenna that has dual 19 dBi gain antennas in a single panel and they are properly positioned with polarization 90 degrees offset from each other (how its supposed to be done if you want to take advantage of MIMO).
The "cool" part is that it has an integrated housing for whatever electronics you want to mount inside it. And it's big enough to hold two "8W" amps plus a battery of your choosing. I found it from various suppliers between $50-$100 and that's a steal for this style product. It's also used by a few notable commercial Wi-Fi access point vendors and thats a very good sign of its quality. They also state ALL the radio spec's on their website unlike some of our other suppliers that have been mentioned in this thread.
Antennas - ITElite
Anyway, for those of you traveling around with 2 big panels in your rig, you can replace them with this single unit and hide all your amp's, batteries, and cables in one enclosure. And it comes with a universal mounting kit. I can't think of a possible better solution for us traveling pilots and our boosting kits.
BTW - this is the highest gain antenna you will find in 2.4 gHz before they get freakishly large in physical size.
EDIT: if you use this antenna make sure to plug your left RC port to the antenna port labeled vertical polarization. You will lose significant performance at max distance otherwise. Many do not use the right RC port, but if you do plug into the horizontal polarization port.
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