ATS25 Ultra Part 3

Additional ATS25 Ultra improvements: 1. Fixed a bug on the board by powering the LNA (U17) from 3.3 volts instead of 5. 2. Added a source follower for matching with the telescopic antenna (this isn't a necessary modification). 3. Removed resistor R47, which was adding noise to the input. 4. Added a shield at the input. 5. I don't yet know what can be done about the noise at 144 and 162 MHz...