If you are new to RF, pick a project with detailed construction procedures, and follow these instructions to the letter (clone, if you will). In RF, lalo na medyo mataas ang RF power output na gusto mo, every details counts. Ground planes, shielding, and components/PCB layout becomes essential parts of the circuit.
Para sigurado, yung mga galing sa mga reputable publications or HAM organizations tulad ng ARRL (ARRL Handbook), QST magazine, CQ magazine. Do not waste your time on RF circuits tested only using simulations.