Antennas
The antenna is an important part of your drone. There are generally two types of antennas on your drone. One will be for your video transmitter (VTX) and the other will be for your receiver module (RX). These antennas are vital with the transmitting and receiving data from your multirotor aircraft, FPV goggles, and the radio. The data from your VTX on the drone will be video data that will allow you to see from your FPV goggles or other devices. The receiver module will talk directly with your transmitting radio that will control the multirotor aircraft.
Best FPV Antenna for Mini Quads 5.8GHZ
A great in-depth article from Oscar Liang that goes into FPV antennas. FPV antenna is the deciding factor that determines the range and signal strength of your FPV system. His guide will explain the basics of 5.8Ghz antennas used on mini quad VTX and VRX, and hopefully, it will help you choose the best FPV antenna.
Introduction to Antenna choices (dipole, circular, helical and patch) from Painless360
A great video from Painless360 that explains the different antenna types in FPV. A high level, the four main types of an antenna (aerials) that you may come across as you embark on your First-person View (FPV) hobby - Whip/dipole, circular polarized, helical and patch. Each of these has benefits and downsides and in this video, he tries and gives a rounded view of each. There is not a perfect antenna for everyone but knowing the best use case can make sure you use the best one for the way you fly.