It increases the directionality and gain of the antenna. This helps it reject noise coming from directions other than towards the transmitter.
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Butterfly • Bowtie Antenna • Batwing Antenna Designer. A large bandwidth of 33% make this an ideal choice for experimenting.
After a delay and finding time in the programme we are going to build the 70cm Bow tie antennas on the 30th September, the cost of the all the parts to complete.