2.4GHz ceramic chip antennas. Very small antennas that work nicely with the Nordic ICs. Don't expect these little guys to perform as well as their ~2" rubber duck counter parts, but then again, these will squeeze onto any PCB layout. https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2008-04-20 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2008-09-24 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2008-10-22 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2015-12-31 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-01-14 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-11-26 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-11-28 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-11-30 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-12-09 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2016-12-13 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2017-11-24 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2017-11-28 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2018-11-21 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2018-11-27 https://elecena.pl/product/633505/2-4ghz-ceramic-chip-antenna 2022-02-22