(22-Nov-2019, 09:31 PM)Krohsis Wrote: Welcome Wingspinner, and glad there is another Extra class ham here, NQ7T.

I will say that TBS' Immortal T is a very poor antenna.  Not sure why...maybe because they are trying to cover too much bandwidth, or perhaps something else.  Outside 2 miles the quality of signal degrades.  By the time you are out 5 miles the quality really falls off and in my opinion it is unreliable.  I have tried several varities of the IT, even those built special by VAS, and all perform pretty much the same.  I want to like the IT, but it just sucks.

As far as the length of the antenna, that is the rational for having the feedline as long as we do is to get the resonate part of the antenna above the CF and other RF reflective parts.  I run much longer than the 82mm you suggest (which is correct) is the minimum best length.  I and a few others tend to run about 9-12 inches, most others run 4 to 7 inches as they are more vain as to appearance.  I always side with functionality over appearance. 

Also, that tutorial is old as you mentioned.  It was the first generation of this RX antenna mod.  There have been significant improvements made since the Gen 1.  The Gen 2 was much improved, and the current generation, the Gen 3 is even better yet.  The Gen 3 antenna uses a sleeve of copper tubing for the passive element, and the whole antenna is built on LMR200 with a solid core.  

I have finally come up with a build routine that produces repeatable results, and I'm getting a VSWR measurements of 1.2 to 1.5 and SNR 18-21.  Once I have some field testing to share, I will do a tutorial on the Gen 3 as well.

73s!

I like your antenna builds.    Will be  happy to see the next one 

Hi, I've been searching for a vertical counterpart to the Immortal T antenna and came across this. I don't really get why TBS doesn't sell a vertical crossfire antenna, but here we are.

Does anyone know, can I just heat shrink the standard dipole antenna to make it vertical? It would be a bit shorter than this, but it would be the much simpler approach.

Edit: I'm looking for an antenna like this: https://cdn.shopify.com/s/files/1/0942/2...1568696144

Ok, I guess I just need a tube and put an antenna inside it like the one in this post.

(29-Sep-2020, 10:33 AM)F.P. Wrote: Hi, I've been searching for a vertical counterpart to the Immortal T antenna and came across this. I don't really get why TBS doesn't sell a vertical crossfire antenna, but here we are.

Does anyone know, can I just heat shrink the standard dipole antenna to make it vertical? It would be a bit shorter than this, but it would be the much simpler approach.

Edit: I'm looking for an antenna like this: https://cdn.shopify.com/s/files/1/0942/2...1568696144

Ok, I guess I just need a tube and put an antenna inside it like the one in this post.

If you're gonna build your own, the below antenna is the best for the money.  If money is no object then THIS is the one build.  The one in this tutorial is superior to the Immortal T but comes with its own warts, and I can't recommend it when you have the other two options which are superior.