Been having an interesting discussion about filtering for VHF and UHF when using the HackRF as a transmitter. Which got me thinking, how hard can it be. Well I now know why VHF and up filters have the copper pours pulled back and everything stitched to the bottom side ground plane. The strays on this are killing me. Its certainly usable, but its rubbish. Boards that work quite fine at HF are almost totally unusable at VHF. There is something new i can incorporate into future designs to improve things more generally. Better design is better design yeah?