The antenna for transmission in 2.48-2.9GHz

Hello, all!

We are trying to bypass the ISM band to transmit data, say outside
2.48GHz. But I cannot find a suitable antenna for this kind of
transmission on ettus.com, the antenna we are using isVERT2450 which is
not ideal outside 2.48GHz. What kind of antenna should we use? Thanks a
lot!

Bill