1. DIY kit: This antenna kit requires soldering ability and firmware burning ability. For convenience, the electronic components are already soldered. 2. Adjustable frequency: The antenna vibrator uses a lever, and the user can easily adjust the frequency by changing the length of the lever. 3. Wide frequency range: It can receive 137MHz signals and is suitable for applications. The frequency can be adjusted by adjusting the length of the pull rod. 4. V-type dipole design: With a V-type dipole structure design, this antenna can enhance signal reception and performance. 5. Optimized length: With a receiving length of 533 mm, this antenna is optimized for maximum signal reception and transmission efficiency at a specified frequency. Product Name:V Dipole Antenna DIY Kit Size: . 180x100x24 mm/7.09x3.94x0.94 inches It's DIY kits, needs to finish by yourself. Specifications: A Antenna Material: PCB Color: As Shown Package Contents: 1 set * V Dipole Antenna DIY Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.