I tried repositioning my original antenna like what you show. iwconfig shows a 5dBm improvement on my work’s guest wifi, from -72dBm to -67dBm. That is a good improvement for just repositioning the cable, but this is still nearly unusable as im sitting about 20ft away from the access point in clear line of sight with no obstructions. Ill be getting a PCB antenna to try soon, ordered it today.
Ordered this one from Adafruit: 2.4GHz Mini Flexible WiFi Antenna with uFL Connector [100mm] : ID 2308 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits