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Different bands may or may not be allowed in different countries, or not with the same rules (power, duty cycle, etc.). Also the exact band may vary (for instance the “900 MHz band” is actually the 868 MHz band in the EU but the 915 MHz band in the US). Some devices may support both, others only one (the RFM69HCW supports both). Lower frequency bands usually ...


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To increase range you can't really buy a 'more powerful' antenna, just a 'more directed' one, since power transmitted by antenna isn't limited by the device or by antenna design, but instead by laws in your country, which limit the power emission by antennas, based on frequency that's used. So to get better range you must be creative - use directed antenna, ...


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