Hi:
You can upgrade to this dual band AC card with Bluetooth, since it also works with just one antenna wire...
Realtek RTL8821CE 802.11 ac 1x1 WiFi + Bluetooth 4.2 Combo Adapter (MU-MIMO supported) HP part # L17365-005.
You can find this model on eBay, or Ali Express,
https://www.ebay.com/sch/i.html?_from=R40&_nkw=L17365-005&_sacat=0&_sop=15
The card will have the same 72 MBPS throughput as the RTL8723BE on the 2.4 GHz wifi band, but on the 5.0 GHz wifi band, it will have a max throughput of 433 MBPS when you have an AC router with an excellent wifi signal strength.
Below is the link to the service manual, where you can find the wifi card removal and replacement procedure.
HP Pavilion Notebook PC Maintenance and Service Guide