gerber quasi-Yagi, 915 MHz - DIRECT-SOLDER SMA AT THE EMITTER (no jumper).
.gtl top copper: element + pin BRIDGE pad into the +y arm + 2 isolated
     post pads; the slit's COPPER gap is unchanged
.gko outline: slit routed x 1..52 and 64..72 - FR4 BRIDGE kept under the jack
.drl SMA pin 1.5 @ (58, +0.5) + 4 posts 1.7 (5.08 sq, KiCad footprint
     SMA_Amphenol_132134_Vertical) + 2x zip-tie 3.0 on the rear tab

ASSEMBLY
1. Amphenol 132134 (or equiv 4-post 6.35 sq jack) on the BOTTOM face,
   pointing DOWN. Solder on the TOP side: pin -> bridge pad; the two -y
   posts -> -y arm (this IS the shield/ground bond); the two +y posts ->
   isolated pads (mechanical only - do NOT bridge them to the arm).
2. Straight plug. Run the cable STRAIGHT DOWN >= 60 mm before any bend
   (FDTD: a lambda/2 vertical drop costs nothing; a parallel-to-board
   run re-tunes the antenna ~-12 MHz and follows cable dressing).
3. Sweep the cable over to the stand and zip-tie down it. Optional: one
   ferrite clamp at the plug for extra dressing immunity.
4. The slit balun is live copper - never bridge the 0.4 mm pin-pad gap
   with solder; inspect after soldering.
FDTD-verified (PML_8, l_drv retuned for the FR4 bridge): see
gerber_yagi_emitter_sma.json on the gallery card.
