Add bluetooth antenna to HM-10 BLE 4.2 Module

Hello,

As the title says, I would like to add some sort of antenna to the HM-10 BLE 4.2 module in order to increase it's range, so the bluetooth is discoverable at bigger distances. Looking to increase the range by 5-10 meters only, nothing big.

I need someone that understands antenna design and has experience improving the range of bluetooth modules.

Thank you!
Marius