Top 5 indoor Alfa Wi-Fi USB Adapters (ranked by overall range)
Below are the top 5 Alfa brand Wi-Fi USB adapters ranked by overall range (ranking begins with top left, goes left to right, then to second row). All of these models get good range and are great choices.
Alfa AWUS036H 1000mW USB Wireless G/B Adapter w/ RP-SMA Antenna
Alfa AWUS036NH 802.11n WIRELESS-N USB Wi-Fi adapter 2 watt
Alfa AWUS036NHV 802.11n 1500 mW WIRELESS-N USB Wi-Fi adapter
Alfa AWUS036NHR v2 802.11n Long Range Wi-Fi USB Adapter & 5 dBi antenna
Alfa AWUS036ACH 802.11ac AC1200 Dual Band High Power WiFi USB Adapter