- What else is in the area
- How many users
- Which Wi-Fi bands are used
- What are the Wi-Fi client devices
- How are devices used
- How many Wi-Fi APs
Need the best antennae`s [sic] with strongest coverage is a meaningless requirement, it purveys no meaningful information.
If you are new to Wi-Fi, I suggest that you read the Ekahau documentation. Have you considered whether you are the right person to carryout this design and installation?