I am trying to improve the signal 
and distance of my 2.4 network on the Netgear R7500v2. I am trying to figure out which antennas are for each network. I have two 9db antennas to use on the router for the 2.4 network. Are the two side antennas for the 2.4 network and the two in the back for 5ghz? Eventually I will be going to put bigger antennas for 5ghz but for right now it is performing great.
you can't the router is 4x4 ac and 3x3 n so you shoud not
the only solution will be buy 4 good dualband antenne.
Ahhh okay thank you. Do certain brand antennas perform better than others? If so what are some good performing dual band antennas I can get?
i don't know, but you should look for dbi capacity, high dbi better
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The stock antennas meet the required frequencies and band distribution, cheap aftermarket antennas (even if they boast with high gain) are often worse than the stock antennas and even expensive/ good ones can only flatten the 'doughnut' (shaped elevation pattern), which brings its own problems.
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