Ham Community | Antennas group | Activity

Jim started the discussion Highest above ground antenna in the forum Antennas group discussions

Mon, 12 Jan 2026 08:25:12 +0000

I was driving past a tall tower yesterday and the most trivial thought came to mind. I wonder how high the highest installed amateur radio antenna sits? Like, is there an antenna at the top of any New York skyscraper. I’m curious both about VHF/UHF repeater antennas and good old, simple HF antennas. I’m not yet talking about whether this is…

Jim replied to the discussion Ca2x4sr Adapter in the forum Antennas group discussions

Tue, 25 Jun 2024 02:22:33 +0000

Reply to Ca2x4sr Adapter

Hi. Sorry I took so long to reply.

I think you need a NMO adapter like this one: https://a.co/d/01Vvkqq4

After that I think you’ll need a mount like this one: https://a.co/d/0dqwO18B

This said, it’s hard to tell by your image if you already have either of these.

Did you buy it without any adapters? Used?

kf5mbr started the discussion Ca2x4sr Adapter in the forum Antennas group discussions

Sat, 15 Jun 2024 18:03:33 +0000

Ca2x4sr Adapter

What kind of connector do I need to attach this to a SO239?

Or, am I missing a connector on the ca2x4sr antenna?

Jim started the discussion Portable masts - from fiberglass to carbon fiber? in the forum Antennas group discussions

Fri, 08 Dec 2023 19:44:36 +0000

Portable masts - from fiberglass to carbon fiber?

My faithful Spiderbeam fiberglass mast (I have two; one of these is my 45-footer, the other is the 60-footer) holding up a, not easy to see, 80M doublet, all this from the back of the car. I admit that I am looking forward to getting myself one of the newer carbon fiber masts. Has anyone tried the DX Engineering ones? I saw them at…

wa8ahz started the discussion Antenna Theory in the forum Antennas group discussions

Fri, 08 Dec 2023 17:04:05 +0000

Antenna Theory

How does an OCF Antenna work?

Ans: by placing the feed point at about the one-third point along the length of the antenna (eg., about 42 ft along a 136 ft long wire if the antenna is for 80m) you are not only exciting the transducer (eg antenna) with near-maximum current flow for both bands that are fundamental (3.5 MHz in this case) but…