Rf solutions zulu m arduino zulu uno arduino radio modem rf solutions zulu m arduino p the rf solutions zulu em arduino em provides a radio modem link with easy interface for up to 2km range the range may be further increased by adding a suitable antenna p p all rf operation is auto controlled with error checking etc so the zulu em arduino em can be treated a s a simple communications device the shield is also compatible with the rf solutions blizzard modem p p the shield i