In Saudi Arabia, cardiovascular diseases (CVDs) account for more than 45% of all deaths, much higher than the worldwide average. Improved low-cost diagnosis and personal health monitoring methods are needed to reduce the economic burden of CVDs on Saudi Arabia’s healthcare system. Here, we report the development of a miniaturized wearable ECG monitoring system that is small, lightweight, and low-cost. Our innovative system comprises fully printed gentle-to-skin ECG electrodes, and a scaled-down printed circuit board (PCB) packaged inside a 3D-printed antenna-on-package (AoP). The system has been tested on adult volunteers' and the results indicate that recorded ECG data correlates well with the data from commercial ECG systems. The custom wearable antenna outperforms the commercial antenna for this application, and offers a ten times larger wireless communication range despite being electrically small. In conclusion, our wearable ECG system offers cost-effective and patient-friendly continuous heart health monitoring, and the screen-printing fabrication method of gentle-to-skin ECG electrodes is expected to facilitate low-cost industrial mass production.