Trim the Antenna?

[rugomol]

This antenna should be thrown into the garbage.
Trimming should improve the characteristics

Three Easy DIY Antennas for Beginners

NOTE: Those who dont want to make a DIY antenna, can order Flightaware’s antenna from Amazon http://www.amazon.com/gp/product/B00WZL6WPO STARTER When DVB-T Dongle is purchased, a whip antenna is supplied with it. Every beginner uses this whip in his starter setup. Improve the performance of this whip antenna by three simple steps given below: (1) Whip is too long for 1090 MHz. Cut it to 67mm. (2) Magnetic base provides an insufficient ground-plane. Enlarge ground-plane by placing the whip …