Hi @gradylink
The antennas are embedded on the inside of the LCD cover.
Below is an image that may help.
Here's the [https://download.lenovo.com/consumer/mobiles_pub/ideapad5_hmm_202002.pdf|hardware maintenance manual] for the laptop.
Go to p.60 (66 of 72 pdf) to view the procedure to remove the LCD cover.
When you have removed them from the back cover, just reconnect them to the WLAN card (remember where the black and white cables were connected to on the WLAN card - take pictures before disconnecting from WLAN card).
[image|3491274]
(click on image)