North America (D820) Nexus 5 model:

GSM: 850/900/1800/1900 MHz
CDMA: Band Class: 0/1/10
WCDMA: Bands: 1/2/4/5/6/8/19
LTE: Bands: 1/2/4/5/17/19/25/26/41

Outside North America (D821) Nexus 5 model:

GSM: 850/900/1800/1900 MHz
WCDMA: Bands: 1/2/4/5/6/8
LTE: Bands: 1/3/5/7/8/20
Antel = LTE Banda 4 (1700/2100, upload/download respectivamente)