ARRL Amateur Extra is a type of amateur radio license granted by the American Radio Relay League (ARRL) to individuals who have passed an examination demonstrating their knowledge of advanced radio theory, regulations, and operating practices.

The Amateur Extra license is the highest class of amateur radio license in the United States and provides the operator with the most privileges, including access to all amateur radio frequency bands and modes of operation. This license is intended for those who have a strong interest in the technical and experimental aspects of amateur radio and wish to pursue it as a serious hobby or as a career.

To qualify for the ARRL Amateur Extra license, an individual must first hold a General class or equivalent license, have a good understanding of advanced radio theory and practice, and pass an examination consisting of 50 multiple-choice questions covering topics such as advanced circuit theory, radio wave propagation, digital communications, satellite operation, and regulatory issues.

Holders of the ARRL Amateur Extra license are considered experts in the field of amateur radio and are often called upon to provide technical assistance and leadership in amateur radio organizations and emergency communications situations. They have the highest level of operating privileges and are able to operate on all amateur radio bands and modes, including high-frequency (HF) bands, very high frequency (VHF) and ultra-high frequency (UHF) bands, and microwave frequencies.

ARRL Amateur extra EXAM Preparation, covering the topics:

1. Commision Rules
2. Operating Procedures
3. Radio Wave Propagation
4. Amateur Practices
5. Electrical Principles
6. Circuit Components
7. Practical Circuits
8. Signals and Emissions
9. Antennas and Transmission Lines
10. Safety

Application features :

- Includes charts and diagrams that can be zoomed in/out to make it easier to answer related questions
- Multiple-choice exercise
- There are 2 hints (Hint or Knowledge, Add TIME for answering)
- More than 50 questions in topic.
- Review the answers for the topic's learning materials.
- Pause the answering timer by touching it.
- Setting delay time to answer the questions and the timer can be frozen.
- Setting for the total number of questions that will appear per topic/ exam, the actual number of questions will be selected by the system if it is less than what has been set.
- it can be running Offline.
- On the topic selection screen, you can see the progress percentage of the exam per topic