SPIDER
Very easy to make by a beginner as it is relatively much less sensitive to dimensional errors.compared to all other types of antennas. However it is NOT high gain, but is good for ADSB if used with short length of Coax, or with an RF Amplifier / LNA for longer lengths of Coax.
(1) Three Easy DIY Antennas for Beginners - Easy Antenna #1 - Spider
(2) QUICK SPIDER - No Soldering, No Connector