Mark-1
Well-known member
I've pondered getting a longer antenna for my handheld VHFs for years, for occasions when I don't need the shorter Antenna for portability.
I know nothing about RF engineering.
Chat GPT tells me 50cm is a good length because it's 1/4 wavelength. Correct?
I've measured the thread diameter on 2 of my radios as 5.9mm. The antennas seem interchangeable. I'd guess that's 6mm? Does that sound plausible? Is that a typical HH VHF thread?
My third radio is an Icom IC-M21, thst has a larger thread which I can't measure. (Radio on boat.) It's this one:
IC-M21 : Handheld VHF Marine Radio - Icom UK
Can some expert radio ham:
- Comfirm a longer Antenna is worthwhile for both Rx and Tx?
- Spoon feed me the Antenna I need to buy for either/any of my Radios.
I know nothing about RF engineering.
Chat GPT tells me 50cm is a good length because it's 1/4 wavelength. Correct?
I've measured the thread diameter on 2 of my radios as 5.9mm. The antennas seem interchangeable. I'd guess that's 6mm? Does that sound plausible? Is that a typical HH VHF thread?
My third radio is an Icom IC-M21, thst has a larger thread which I can't measure. (Radio on boat.) It's this one:
IC-M21 : Handheld VHF Marine Radio - Icom UK
Can some expert radio ham:
- Comfirm a longer Antenna is worthwhile for both Rx and Tx?
- Spoon feed me the Antenna I need to buy for either/any of my Radios.