$27.82 – Frequencyrange(MHz): 5500-5800, Net weight（g）: 19, VSWR<1.5, Half power beam: 75°H-plane 40°E-plane, Impedance(Ω): 50, Max.Powe(W): 10, Front-to-backratio(dB): >10, Polarization: Right circular polarization, Antenna size(mm): 82*42*24, Gain(dBi): 11, Input: SMA, Ambienttemperature（°C）: -40～+6.
Right now the best price with coupon code for MAPLE Wireless 5.8Ghz 11dBi RHCP FPV Antenna is $27.82 (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($27.82)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. What about the price? Well, this price is higher than average price ($24.59)
Link: Banggood product page
Price: $27.82
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Parts8, BGJON8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGToys8, BGMatt2022, BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for MAPLE Wireless 5.8Ghz 11dBi RHCP FPV Antenna. The lowest price was: $17.99.
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)).