Radiomodem

• DIGI 1 Watt/900 MHz stand-alone radio modems XTend® RF Modems

• datasheet
• price ~ $300
• Digikey ...$299
• Mouser...246 EU
• Range change ratio: LINE_OF_SIGHT / URBAN = 24.4

From Datasheet:
Indoor/Urban range             (w/ 2.1 dB dipole antenna): Up to 3000 feet (900 m)
Outdoor RF line-of-sight range (w/ 2.1 dB dipole antenna): Up to 14 miles  (22 km)
Outdoor RF line-of-sight range (w/ high gain antenna):     Up to 40 miles  (64 km)
...
Receive current:                                     110 mA
Transmit current (1 mW - 1W Tpower output):    110 - 900 mA
.
Idle current (various cyclic sleep intervals):  19  - 39 mA

• Max current only at Transmit
• Cyclic sleep possible

Antenna

• DIGI 5.1 dBi 174 EU

datasheet

• DIGI 2.1 dBi 20 EU

datasheet

• DIGI YAGI 11.15 dBi 70 EU

datasheet