I think the new extender has higher power (specifically multiple 600 mW transmitters) than the Netgear extender I am already using (I think 50 mW, but am not sure). It seems to me that a higher gain antenna would improve the signal transfer. I recently bought a new different extender that only extends the 2.4 GHz signal (an Ampedwireless SR10000) that has two removable omni-directional 5 dBi antennas, and I need antenna recommendations as to how best improve the connection between the buildings. But, as I said, when it rains, and occasionally at other times, I get no incoming signal (light is not even red, it is "off") and there is no use-able internet. In good (not raining) weather, the indicator lights sometimes indicate that the incoming signal is "good" (green light), sometimes fair (amber light), but often the incoming signal is "poor" (red light), but I still get use-able internet even when the signal is "poor". This Netgear EX3700 extender works pretty well most of the time, but it cannot pick up the incoming signal when it rains. (I am assuming these two rods are not acting as a single dipole antenna.) This Netgear EX3700 extender is mounted in a window from which you can see the building that is the source for the 2.4 GHz signal. I think these rods are two 3dBi omnidirectional monopole antennas. I am presently already extending the 2.4 GHz signal to the distant building using a NETGEAR WiFi Range Extender EX3700 which has two single move-able rods on either side of the extender housing (in a kind of rabbit ear arrangement). There is a some foliage between the buildings, but there is generally pretty good "line of sight" between the buildings. I want to have the antennas preferably be inside and be simple omnidirectional antennas. I want to use the extender to supply wifi to a building by picking up a 2.4 GHz wifi (incoming) signal from a neighboring building that is about 300 feet away.
I need some recommendations regarding the kind of performance I can expect from various gains of omnidirectional wifi antennas that could be attached to a wifi extender (the extender has detachable antennas).