Length of radials on spider antenna

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Without an impedance meter, you just need to be in the ballpark with your DIY 1/4 wave ground plane antenna. Browse this link for more background …

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 …