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Thanks, VE1BLL.

Actually, the narrow beamwidth is used to distinguish unwanted objects. I think parabolic antenna should have relatively narrow lobe compared to Yagi.

40 ft away from the antenna. in another word, the object we are about to detect RF signal is 40 ft away.

Antenna Gain is not important for us. And we could always add amplifier to the link.

The bands I would like to cover are all cellphone bands. 800-1000MHz and 1800-2000MHz. It's a kind of cellphone signal receiver.

Hi all, Looking for a special small size cellular band antenna with very sharp front end radiation pattern. I hope it could be less than 10 degree at half power point. Of course the smaller the better. I have tried Yagi, but it's not narrow enough. The antenna will be used as a receiver only...