Operating frequency: 5.8GHz, Match: Return loss (S11) <-20 dB, standing wave ratio (VSWR) <1.15 (center frequency), Gain: 2dbi, Interface type: SMA Male/ Female (Optional), Item name: FPV Antenna, Axial Ratio: <1.3, Bandwidth range: 500MHz (5.5 - 6.0 GHz), Radiation efficiency: 95%, Brand: iFlight. Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGiFlight, Parts8, bGhOnEy10, BGdragonBoat, bgshOOp10, BGRC902, BG11SHOP, BGAFF7OFF, 13f142, BGCuponation10, BGDAVIS, 00c906, BGGAL8, BGJON8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGRCT10, BGJUNEGSG9, TTSUMMER8, Cuponation9, BGToys8, BGMatt2022, BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – iFlight 15CM 5.8G 2dBi Pagoda FPV Antenna [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for iFlight 15CM 5.8G 2dBi Pagoda FPV Antenna. The lowest price was: $8.99.
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)).