Cantennator is a free Android application that allows users to calculate the sizes of popular homemade antennas for different digital networks such as Wi-Fi, 3G-UMTS, 4G-LTE, and digital television. Whether it's a Tin Can waveguide antenna, Spiral antenna, Yagi-Uda, Bi-Quad antenna, Double Bi-Quad antenna, or Collinear Coaxial antenna, Cantennator has got you covered. All you need to do is input the mode of device working (3G, 4G or Wi-Fi) or operating frequency, and Cantennator will calculate the sizes of the antenna for you.

The app is easy to use and comes in handy for those who want to improve their network signal reception. The ability to calculate the sizes of different antennas makes it a must-have app for professionals working in the telecommunications industry. Cantennator is also suitable for beginners who want to experiment with making their own antennas. Overall, Cantennator is a useful tool for anyone who wants to improve their network signal strength, and it's available for free on the Google Play Store.