Dec 14, 2020 · Best AM/FM Antennas Buying Guide. Now that we have introduced you to some of the best AM/FM antennas available out there, it is time that you know what to look for when buying the best product. So, we are going to tell you all about them below. A 75-ohm Antenna. 75-ohm antennas are generally better than others, such as 50-ohm. I wanted to make a loop antenna for receiving WWVB based on the Amidon R33-050-0750 Ferrite rod. This uses the type 33 material and is 1/2" diameter by 7.5" long. This uses the type 33 material and is 1/2" diameter by 7.5" long.
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