$52.99 – that is current price with coupon for iFlight Crystal HD Patch 5.8GHz 9dBi Flat Panel FPV Antenna (in Banggood). Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Gain: 9 dBi, Brand: iFlight, Axial ratio: ≤1.6, Bandwidth: 5600~5900 Mhz, Radiation Efficiency: 93%, Polarization: (LHCP/RHCP) Left/Right Hand Circularly Polarized, Weight: 52.1g, Frequency: 5.8GHz, Impendance: 50Ω, Beam Width: 105° H. 75° V., Cable: RG178, Dimensions: 16mmx 7mmx 3mm, Connector: RP-SMA (Fits DJI Goggles directly / not to be used on standard SMA)
Latest price update (UTC time):
Banggood ($52.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Good or bad price? Looks like a good price to me (average is $58.44).
Link: Banggood product page
Price: $52.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGDAVIS, Parts8, BGJON8, BGRCParts8, Tabby20, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGJUNEGSG9, BGRCT10, BG8ReviTrage, Cuponation9, COUPONSDE1wk, BGMatt2022, BGToys8, BG8OFFCOUPON, TTBLACK5, BGSaleFeb8, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – iFlight Crystal HD Patch 5.8GHz 9dBi Flat Panel FPV Antenna [EU] ($-3)
Aliexpress
There’re some similar (or not) items on Aliexpress
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 iFlight Crystal HD Patch 5.8GHz 9dBi Flat Panel FPV Antenna.
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)).