After running all “433” antennas we had through a spectrum analyzer, I am very disappointed.
95% of all “stock antennennas” with SiK radios are just 2.4Ghz antennas, that show about 8db loss (emission) around 433Mhz
Tested five 433 antennas from Farnell , which were really about 500Mhz.
This is very disappointing.
Does anyone here have a known good source for 433-435Mhz , small, light , omnidirectional (rubber duckies or dipoles?) - anything with a donut radioation shape?