
If you need to boost the Internet connection in a building with two or more stories, then I believe that this is the best alternative available rather than a Wi-Fi repeater because it does not load up the primary Wi-Fi network in the same way.

High Gain Wireless Network Adapter - TP-Link Nano USB Wifi Dongle with 150Mbps Speed for PC Desktops and Laptops. Compatible with Win10/8.1/8/7/XP Linux 2.6.18-4.4.3, Mac OS 10.9-10.15 (TL-WN722N)
46 Review

πΆ TP-Link TL-WN822N USB Wifi Dongle - Ultra-Fast 300Mbps Wireless Network Adapter for PC/Laptops. Supports Multiple OS Including Win10/8/7/XP, Linux, and Mac OS 10.9-10.15!
27 Review

π ASUS USB-BT400 USB Bluetooth Dongle Receiver - Compatible with Laptops and PCs, Plug and Play for Windows 10/8/7/XP. Supports Printers, Phones, Headsets, Speakers, Keyboards, and Controllers in Black.
79 Review

TP-Link Archer T4U Plus AC1300 USB 3.0 WiFi Network Adapter
29 Review

π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review

HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
12 Review

π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review

π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review