“Stellar activity and plasma turbulence near a transmitting planet can broaden an otherwise ultra-narrow signal, spreading its power across more frequencies and making it more difficult to detect in traditional narrowband searches.”
Science paper: https://iopscience.iop.org/article/10.3847/1538-4357/ae3d33
Review article: https://www.theregister.com/2026/03/10/seti_admits_its_search_for/
Broadening of specral lines info: http://www.hyperphysics.phy-astr.gsu.edu/hbase/Atomic/broaden.html
One more thing. If ants where the dominant tech specie of this planet. Would they use radio or similar tech? Why do we presume a similar body to ours when we talk about aliens? What if they are fungui like, or bee like or polilla like or a blob that communicate trough chemical signals.
As many has pointed out, we are looking for a narrow tech advancement and also a narrow conception of body building