https://www.acantcomm.com/products/433-mhz-ism-low-profile-customizable-magnetic-mount-antenna-ac-q433i21/ 433 MHz ISM Low Profile Customizable Magnetic Mount Antenna (AC-Q433I21) High quality and durable high gain omnidirectional 142mm long antenna with 3meter coaxial cable and SMA connector. 433MHz is a commonly used frequency band for all types of equipment that require little power, such as garage door openers, headphones, baby monitors and remote controls. Omnidirectional antennas are used in most consumer RF wireless devices, including cellular telephone handsets and wireless routers. Designed with a magnetic base. The antenna can be placed on any iron surface. horizontally or vertically. However, the vertical position is recommended for better signal.3meter coaxial cable with SMA connector for easy connection, so no extension is needed