The Unlicensed Bands

433MHz
868MHz
915MHz

Antenna

Wire antenna

A very good antenna to use for maximum range.  Use a length of wire (or a PCB track) 1/4 wave length (e.g. 172mm for 433MHz).  The optimum is to use the wire straight, but it can also be bent into a 'L 'or 'U' shape if necessary (it will reduce the range a bit but it still works well).

A wire antenna is better than PCB loop

Helical (Coil) / Spring antenna

Also commonly used.

PCB loop

Good for ease / low cost of manufacture, but range is reduced.

 

 

 

 

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