I have just checked coupons. The lowest price I could get is 6.9 USD for Realacc Pagoda (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood (6.90 USD)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it a low price? This is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: 6.9 USD
6.9 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Parts8, BGGAL8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, BG8RCToy, BGJUNEGSG9, BGRCT10, 9OFFSUMMER, Cuponation9, BGToys8
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for Realacc Pagoda Antenna RHCP 5.8G 5dBi 50W 75mm FPV Antenna on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Realacc Pagoda Antenna RHCP 5.8G 5dBi 50W 75mm FPV Antenna.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).