Please note: You will have to install a driver to get this unit working on Raspberry Pi. ThePiHut has done an excellent job in explaining how to do this.
If the on-board WiFi antenna on your Raspberry Pi isn't giving you enough range, this dual-band 2.4GHz/5GHz USB 2.0 WiFi adapter is a great option.
The antenna is dual-band meaning it can connect to a 2.4GHz or 5GHz network, and supports the 802.11ac standard (3 times faster than 802.11n networks).
The USB 2.0 adapter features an LED status light and removable antenna.
Features
- Compatible with Raspberry Pi 3/4/5 
 - 150Mbps at 2.4GHz and 433Mbps at 5GHz
 - The external high gain adjustable & detachable antenna provides wide coverage for your wireless network
 - Backwards compatible with 802.11n/g/b/a
 - LED status light
 
 
Tech Spec
- Chip: Realtek RTL8811cu
 - Interface: USB 2.0
 - Wireless transmit power: 20dBm
 - Network Speed: 600Mbps
 - Network Mode: Dual Band
 - Applicable System: Windows Vista / XP / 2000/7/8/10, Linux, Mac OS
 - USB Head Size: 4.5 x 2 x 1.2cm
 - Antenna Length: 10.8cm 
 - Net Weight: 12g
 
 
What's in the box?
1 x Dual Band 2.4G/5G USB Wifi with Antenna Adapter