I use the Alfa AWUS052NH USB WiFi adapter for the 5Ghz network of my Raspberry Pi wifi router. Thought I’d share my config file so others can quickly get up and running with this adapter.

# hostapd.conf
# see example config for more info:
#   https://w1.fi/cgit/hostap/plain/hostapd/hostapd.conf
# set region
ieee80211d=1
country_code=US
interface=WLAN-DEVICE-HERE
ssid=YOUR-WIFI-NETWORK-NAME-HERE
# auto channel selection via channel=0 might work
channel=36
# a is for 5ghz
hw_mode=a
macaddr_acl=0
# auth_algs=1 to use open system auth:
# https://superuser.com/questions/1240876/802-11-authentication-frame-response-wrong-authentication-algorithm-detected-b/1240921
auth_algs=1
ieee80211n=1
# wpa=2 is wpa2
wpa=2
wpa_passphrase=YOUR-WIFI-PASSWORD-HERE
wpa_key_mgmt=WPA-PSK
# we want wpa2, so use CCMP
rsn_pairwise=CCMP
wmm_enabled=1
ht_capab=[GF][HT40+][SHORT-GI-40][RX-STBC12][TX-STBC]
logger_stdout=-1