Flightradar24 is a network of receivers around the world. Some receivers are online 24/7 and others are only online from time to time. There are many reasons why a receiver could be offline.
There can be a technical problem with the receiver, antenna, or Internet connection. There is also a possibility that the owner of the receiver has closed down their receiver.
With over 13,000 receivers connected to the network, Flightradar24 cannot tell why different receivers are offline, and when they will be back online.
If you want to ensure coverage in your area, please see the options below.
You can apply for a receiver or build your own FR24 receiver:
https://www.flightradar24.com/apply-for-receiver
https://www.flightradar24.com/build-your-own