## 6 Conclusions  
This research proposed a portable wideband of a horizontally polarized directional antenna scheme with a radome for digital terrestrial television reception (470-890 MHz). The proposed antenna scheme was adapted from the Yagi-Uda antenna, consisting of a folded bowtie radiator, semicircular corrugated reflector, and V-shaped director. The radome was of thin cylindrical ABS material. Simulations were carried out to optimize the antenna parameters. An antenna prototype was fabricated, and experiments were undertaken to determine the antenna performance. The performance metrics included the impedance bandwidth (\(1S_{11}\)\({}^{1}\)\(\leq\)\(-\)10 dB), gain, and unidirectionality. The results indicated that the folded bowtie radiator enhanced the impedance bandwidth of the antenna. The corrugated reflector improved the impedance bandwidth and unidirectionality, and the V-shaped director increased the antenna gain. The measured impedance bandwidth of the proposed antenna scheme was 75.93%, covering 424-943 MHz, with the measured antenna gain of 2.69-4.84 dBi. The radiation pattern was unidirectional for the entire target operating frequency band. The measured xz- and yz-plane HPBWs were 150\({}^{\circ}\), 159\({}^{\circ}\), and 160\({}^{\circ}\) and 102\({}^{\circ}\), 78\({}^{\circ}\), and 102\({}^{\circ}\) at 470, 680, and 890 MHz, with the corresponding cross-polarization below \(-\)20 dB and \(-\)40 dB. In addition, the ABS radome had a negligible effect on the impedance bandwidth and the antenna gain, vis-a-vis the antenna scheme without the ABS radome. The outdoor and indoor testing was also carried out to assess the outdoor and indoor reception performance of the proposed antenna scheme. The power obtained for the outdoor test, at 514 MHz, was 38.4 dB\(\mu\)V (\(-\)70.4 dBm) with a C/N of 11.6 dB. Meanwhile, the power obtained for the indoor test was 26.6 dB\(\mu\)V (\(-\)82.2 dBm) with a C/N of 10.9 dB. Essentially, the proposed portable wideband directional antenna scheme is operationally suitable for indoor and outdoor digital terrestrial television reception. Moreover, the portable antenna with a radome serves as a home decorative accessory given its modern and stylish design.  
Figure 24: The experimental setup for the reception test in actual use.  
**Author Contributions:** Conceptualization, B.L., R.P., P.J., K.P., S.D., S.K. and C.P.; methodology, B.L., R.P., P.J., K.P., S.D., S.K. and C.P.; investigation, B.L.; writing--original draft, B.L.; writing--review and editing, S.K. and C.P.; supervision, S.K. and C.P.; funding acquisition, B.L. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This work was financially supported by the Office of the Permanent Secretary, Ministry of Higher Education, Science, Research and Innovation under Grant No. RGNS 63-103, and King Mongkut's Institute of Technology Ladkrabang under grant no. 2564-02-01-006.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Acknowledgments:** The authors would like to express sincere appreciation to the Institute of Research and Development, Rajamangala University of Technology Rattanakosin, and the School of Engineering, King Mongkut's Institute of Technology Ladkrabang, for the facility and technical support.  
**Conflicts of Interest:** The authors declare no conflict of interest.