hardware for 2.4 and 5 GHz

Hello,
i am looking for a Mikrotik outdoor-hardware like the Groove or SXT which supports 2.4 and 5 GHz simultanous with different configuration. As example using 2.4 for an AP and 5 as a client.
There is the Groove 52HP, but it can only handle one frequency at one time.
Is the only way to do this by using a routerboard and some PCIe-cards in an outdoor-housing?

spel

NetMetal is for you. It has a miniPCIe slot, where you can put a second wireless card. With one wireless already built in, this way you can have two simultaneous APs. http://routerboard.com/RB922UAGS-5HPacT-NM