Should I make 2 helical antennas? One for 2.4 GHz and another for 5.8 GHz?

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Malcolm White

A conical or planar spiral antenna fed at the tip/centre will do all the frequencies.

Did you mean helical antennas? I think 400 MHz to 900 MHz is a very wide band for a helical antenna.

Tahir Azam

Sir the range of helical antennas is around 30MHz to 3GHz ...I think we can make such a type of any helical antennas laying in this range..