$14.85 – 150mm Triple Feed Patch 5.8GHz 14dBi FPV Antenna (Banggood, Aliexpress: Center frequency: 5.8 GHz, Radiation efficiency: 75%, Axial ratio: 1.05(0.38dB), Antenna gain: 14.4 dBi, Matching: S11 < -30 dB / VSWR < 1.065, Half power beam width: 30° (horizontal and vertical), Bandwidth: 660 MHz (5.47 – 6.13 GHz) (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $14.85 for 150mm Triple Feed Patch 5.8GHz 14dBi FPV Antenna (in Banggood). Price history, coupons and price alert are available on this page. What is best price?
Latest coupon and price update (UTC):
Banggood ($14.85)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Price? Current price is the lowest in history (according to CouponsFromChina database)!
Link: Banggood product page
Price: $14.85
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): Parts8, BGJON8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGRCT10, BGf610c0, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGToys8
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for 150mm Triple Feed Patch 5.8GHz 14dBi FPV Antenna. The lowest price was: $14.85.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).