Statistical resolution limit (SRL) — closest two targets tellable apart vs SNR · hover a point (session 014z DF model)
9.05 dBi · F/B 16.2 dB, flat 14.9–16.2 across ±20 MHz detune · S11 −34.6 dB @915 (Zin 52+1j — direct 50Ω, no matching network; Re Zin flat ~52Ω over 0.8–1.0 GHz) · res 913 MHz · beats the fully-margined earlier version (8.4 dBi · F/B 15.0 · S11 −17.3) on every metric · directors HUG the copper (uploaded-gerber look, no FR4 apron) and are RE-TUNED +10 mm (126/122) to repay the lost dielectric loading — the driven (match) and reflector (Moxon null) keep 3 mm FR4 aprons · one CONTINUOUS central boom rib spans reflector → both directors; INCLINED side rails follow the element-tip envelope so every director ties into the frame at its own height · FAT low-Q copper (driven/directors 12 mm, feed strips 10 mm, Moxon tips 12 mm) · l_drv 120, tip_x 20, gap C 22 · director length sits 4+ mm below the parasitic-resonance rollover (still F/B 15.1 at +14) · slotline balun, coax solder pads (centre→+y arm, shield→−y arm→reflector) · Gerber + STEP + DXF (CST Studio 2024-ready: import the STEP as solids, or the layered DXF — COPPER/BOARD/DRILL — and extrude; zip README has the steps + port placement)
⬗ stack-up: FR4 1.6 mm (εr 4.3) · 1 oz Cu (35 µm) · single top layer · CNC-routed: continuous boom + inclined rails, directors hug the copper