My house is on the 6th floor, and I started using a 4-band antenna (with a length of 20 cm, sloped downwards), but it only supports bands 7, 14, 21, and 28. The other bands are not working properly.
I saw an article that mentioned a 1:9 Balun with a 16-meter dipole and ground wire, which can be used for enjoyable experimentation on most amateur radio bands.
Could you please advise on which of these two antennas is better?
What is the optimal length for a 1:9 scale Balleine line?
Choose between a 16-meter and a 21.9-meter option, and determine which one is better.
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