With BLE operating in the 2.4GHz frequency range, a 2.4GHz-only antenna would work fine. But even if you connected a dual-band antenna, it would still work. You would just be connecting a more expensive antenna in that case and the 5GHz capability wouldn't be utilized.
The connector and installation of the 7662 should be covered in either the spec sheet and/or an installation guide, available in the documentation section of the website.