$7.59 – Realacc 5.8G 5dBi 50W FPV Pagoda Antenna (Banggood, Aliexpress: Max. Dia.: 22.4±1mm, Length: 78±3mm, Max. Power: 50w, Gain: 5dBi, Min. Dia.: 11.8±1mm, Item Name: Omnidirectional Antenna, Weight: 8.6g, Color: Black / Red / White, Connector: RP-SMA /SMA, Brand Name: Realacc (the best price with coupon)).
ATM you can buy Realacc 5.8G 5dBi 50W FPV Pagoda Antenna for $7.59 (in Banggood). Just check coupons out (with price alert and history). Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood ($7.59)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? According to my database, the average price is $9.79 and current price is $7.59, so it’s probably a good price!
Link: Banggood product page
Price: $7.59
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): Parts8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, BG8RCToy, BGJUNEGSG9, BGRCT10, Cuponation9, BGToys8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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
Here is price history (for all/most countries) for Realacc 5.8G 5dBi 50W FPV Pagoda Antenna. The lowest price was: $6.29.
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)).