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I'm interested in getting one. From a prepper perspective it would be good to be able to transmit on HF. My main reservation is that I don't have an antenna anywhere close to working with 40 meters, and it appears to be much more involved than getting an antenna that works for 2 meters.
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A 40M dipole is a simple as wire from Home Depot or Lowes. I won't assume that you're unlicensed. I'll assume that you are unpracticed so far.
And that you will practice. Because from a prepper perspective you know that practicing as if the training was the real thing is important for when it is the real thing.
When you're hungry is not the time to learn to hunt/trap & skin/cook.
When you're hurt is not the time to learn first aid.
When you're being attacked is not the time to learn to use your firearms.
When you need to communicate is not the time to learn to use your radio.
True enough right?
If you need help determining the relationship between frequency and length you probably should review the ham radio 101 posting here.
If you need practical advice on how to get an antenna up in the air from folks that have been there/done that we are definitely the group to ask.
happy prepping. And remember - bad weather makes good training. :)