stubby antenna mast

[Burdar]

Does anyone run a short antenna?  I don't like the long factory ones.  I'm looking at a few different styles online but they all are threaded for metric fasteners.  It looks like the original thread was 1/4-20 and the new ones I'm seeing are 5mm.  A google search said you can't drill and tap a 5mm threaded hole for 1/4-20 threads.  The adapters that come with the antenna are all variations of metric thread.  I haven't seen any adapters that convert 5mm to 1/4-20.

[Bullitt-]

Would these tri pod adapters do the trick?
1/4" Male Threaded to M5 Male Threaded screw Adapter

https://www.amazon.com/ECSiNG-Adapter-Converter-Accessories-Monopod/dp/B0CCRPDXGP/ref=sr_1_3?

https://www.ebay.com/itm/146053745518?

[Burdar]

They might.  Thanks for that link.  I'll have to look at the antenna base on the car and see how far down the threads start from the top.  I think the threads start down lower in the hole and the 1/4-20 section of those adapters is really short.  I might be able to machine off the middle section so it would screw in farther.

[Dakota]

Does anyone run a short antenna?  I don't like the long factory ones.  I'm looking at a few different styles online but they all are threaded for metric fasteners.  It looks like the original thread was 1/4-20 and the new ones I'm seeing are 5mm.  A google search said you can't drill and tap a 5mm threaded hole for 1/4-20 threads.  The adapters that come with the antenna are all variations of metric thread.  I haven't seen any adapters that convert 5mm to 1/4-20.

I have a stock antennae mast that wants a new home if you end up needing one. 

[Mr Lee]

I have one... but I'm sorry... couldn't tell you where I got it.  It was one of those things that I just had laying around in a box of parts that I didn't even know I had.  Probably came off of a parts car maybe?  I dunno.  Did Challengers come with these shorties, and if so, why?  It'll barely get you one or two radio stations but I don't really listen to the radio much in my Challenger.  I like the fact that the car cover goes over it.   

[Mr Lee]

What cars did the shortie antennas come on?  Now I'm even more curious where I got this thing  lol

[Bullitt-]

here's one that comes with the 1/4-20 adapter, they seem to make it in 4" & 8"
http://www.metraonline.com/part/44-RMCF

This appears to be the same product .... My local Autozone shows them in stock
https://www.autozone.com/electrical-and-lighting/antenna/p/metra-electronics-carbon-fiber-4in-antenna-mast/220433_0_0?spps.s=31
8-inch
https://www.autozone.com/electrical-and-lighting/antenna-mast/p/metra-electronics-antenna/220466_0_0

similar part with adapter
https://www.supershops.com/products/audio_mobile_electronics/antennas_and_accessories/parts/MET44-RMSR

[MoparLeo]

Just in case you want to know why you need a longer antannae. The length of the antannae is based in the frequency tune of the radio. Radio frequency is determined by the length of the radio wave.Am waves are much longet than fm waves. Most car antannaes are tuned for the shorter fm wave and are about 30" long. They are about 1/4 length of the fm wave .
They are a compromise length. Closer to ideal length for FM reception an good enough for AM reception.