Why not? You seem to know everything about everything else.
BTW, since you seem to have forgotten, it used to be standard practice to route antennas out of the top of the fuse and up to the top of the vertical stab. It was also a standard practice to route the antenna inside the fuse using a zig zag pattern for better reception. My first two planes were routed in those ways per an instructor's directions in Idaho Falls ID. That was back in 1986 and, since AM and FM systems haven't really changed, that is unless you have a PCM or 2.4GHz system, that information is still good. A CF control rod can still affect how a signal is received, considering CF is used to make antennas used in two way communications but, then again, that's old school tech that's not used anymore for anything in R/C, especially aircraft.
Since you know everything, what fuel do I need for my boats? I have boats that run .21, .45 and .67 sized engines. Can I get away with 5% nitro or is that too much?

My current bench-https://cimg2.ibsrv.net/gimg/www.rcu...d328742a90.jpg

Also this, since I live on a lake.https://cimg4.ibsrv.net/gimg/www.rcu...992427211c.jpg

Love the sail boat. Which one is it?

Garage sale find. 15.00 bucks. It's a bit old; will need newer rigging.

I haven't seen one of those in years. If the wood is still in good shape, you done good

Anything, ANYTHING to include the air will attenuate the signal of any radio. Placing the 72 antenna outside the fuselage gets it away from ANY potential interference. Do you have to? NO! But I have also seen it solve problems.

The 2.4 has little choice based on the current designs. But try 2.4 in a submarine sometime for a real lesson in radio systems. And a 2.4 low in the hull of a boat can be blocked by waves. Makes for loads of fun.

Scary thing is I recognized the hull design without being told what it is. If the wood is still good, finish the thing and sail it. If you need help doing so, just ask.

My Six Meter during construction. Glass hull, the rest scratch built by me. White Oak planked deck with Mahogany trim. 60 inch LOA and about 22 pounds rigged.

https://cimg0.ibsrv.net/gimg/www.rcu...e9fa62cd59.jpg

Actually the zig zag pattern was to make it fit in the fuselage. In reality you de-tune the antenna with each and every bend. Having erected many wire antennas, the best thing for a wire antenna is to be as straight as possible. Now, the amount of de-tuning was so minimal as far as the Rx was concerned, that the practice worked for our purposes.

A great many things effect signal propagation. Power out of the TX combined with Rx sensitivity just to start. Neg 80 db is a typical level for our receivers. Very difficult to see on a scope because background radiation runs at those levels too. Frequency is another big factor. 75MHz for the sub guys can go as deep as 10 feet depending on water condition. And sometimes even more. While 2.4 simply does not penetrate water to any real amount. An inch if you're lucky. Weather also impacts propagation. Humidity will play havoc. In the micro wave communications world it's called Rain Fade. 23 Gig MW systems I could push a signal 10 miles in the desert at 100 mW. Let it start to rain and I'd be lucky to go 100 yards. But my Satcom systems at 7 Gig would do 23,000 miles on just a couple of Watts. And even the sun can play with it. Ever get a hit when you fly past the sun? It happens. Not often but it does happen. And I suspect it happens more often with 2.4.

But don't believe me. I've just worked the environment for over 40 years.

Actually, when the Spectrum 2.4 radios first came out, they were a liability in boats. I saw several boats crash using them in water conditions that didn't seem to affect boats using FM and PCM systems on 27 and 75MHz. When the carbon fiber and carbon fiber reinforced boat hulls first showed up, there was issues where the radio signal wouldn't get to the receiver antenna. This was remedied by running the antenna out of the hull. This was even more important when using a 2.4 radio. In fact, some surface 2.4 receivers actually are shipped with an antenna over twice as long as a comparable airborne receiver for just that reason. None of this is theory, it's fact

A 1/4 wave antenna for 2.4 is just shy of 5 inches long. All of which should ideally be outside any carbon. Unless there's something else at work here. Please enlighten us with your expertise and explain WHY you have only 1/2 inch of antenna outside the fuse?

I'm more curious as to shy he has such a sharp bend in the antenna tube? I'd be worried that the shield braid would be damaged by the sharp bend, changing the effective length of the antenna from .5" to the overall length between the tube curve and the end of the antenna

So the antenna is essentially base loaded so it presents a 1/4 wave electrically to the RX. While electrical length is the more important measurement, physical length does play into it and I would suspect in a hard core test, the 1/2 inch would not have the same max range as the others with a full 4.92 inches.

Note: Numbers may vary depending on specific make/model of ILS. But the numbers used are from my personal experience. Sad that such a disclaimer is necessary to prevent trolling.

Instrument landing system Localizer has 14 sets of antennas. Each set has two active and several passive antennas. A total of 28 cables, roughly 120 feet each, run along the 120 foot or so of the array feeding the active antennas. These cables must be cut to specific electrical lengths. A Vector Volt Meter was the tool when I was doing it. It measured the length in degrees of phase. The kicker? The cables were not all the same. Four more cables to the equipment van also had to be phased. All in all we would start with some 4,000 foot of cable which had to be one continuous length to ensure it all reacted the same to the environment. No splices! No pieces! All one cable almost a mile long. And a crap load of N connectors because 1. the cables had to be measured with a connector on each end and 2. when you pulled a connector to trim the cable, you had to put a new connector on. No reuse of connectors.

My Workcenter took 18 days to restore an antenna array which had been center punched by a T-38 aborting a take-off. The Electronic Installation group across town estimated 1 to 2 months to restore it. Being a flight training base, flight ops had to be suspended until the ILS was repaired. We had the manpower, the knowledge and the equipment necessary to do it. 18 days vs 1-2 months saved the Air Force millions in lost training. In the meantime two of my E-3 Airmen took on the task of handling all the daily maintenance, checks and monitoring of three other full ILS systems, a TACAN and a TVOR.

Just one example!

What was the rule of thumb for coax? Bend radius at least 6 times the diameter of the cable?

There is in your picture of the RX.

Yeah? Which one?

Anritsu