This is surely just a Luddite beat up, isn't it? Airborne weather radars are typically X-Band (9.3-9.5 GHz - the Collins WXR-2100 is 9.33 GHz, the Honeywell RDR-4000 is 9.375 GHz) so there's no issue there. Ground based meteorological radars are either S-Band (2.7-2.9 GHz) for very long ranges, C-Band (5.6-5.65 GHz) for ranges of 200 km or so, or X-Band for near range stuff. Apart from the fact that there's no frequency overlap mobile phone tower antennas are tilted down so that they point at the punters carrying their mobile devices. Weather radars on the other hand tend to point up 'cause that's where the weather is.