WRVR303

Here's a source for fiberglass antenna components: Max-Gain https://mgs4u.com/

How much loss you have in your cable is very dependent on what type of cable you use. There are many online cable loss calculators out there. One is https://kv5r.com/ham-radio/coax-loss-calculator/ Personally, after looking at several manufacturer's antenna radiation patterns, I concluded that about 7 dBi of gain was ideal, because it put most of the energy out concentrated in about a 40* pattern, or 20* going up above horizontal, and 20* below. I live in a hollow, and the ridgeline is 10* above horizontal, so there's a good bit of power getting out over the hill. A 9dBi or greater antenna would put most of the energy into the hill, while 3-5 dBi would hit the ground below the antenna and the birds above, but might not reach the local repeaters.

Listen in on 462.650 MHz (with no PL tones set, so you hear everything on the frequency) tonight (Sun Nov 10) from 7pm onwards, and you should hear The Rabbit Hole net going on. Or, listen every Thursday at 7pm for the weekly group discussion net.

I'm not aware of any sort of comprehensive GMRS coverage map / data base, probably because repeaters are owned by private individuals who all operate independently of each other. They may have their own maps, but they are not all conglomerated. So, you have to figure out where the repeaters of interest to you are, how high the antennas are off the ground, and then make your own maps. Note that very few, if any, of the repeaters shown on the MyGMRS maps are in the actual location shown, so any plots based on that info will be misleading. And, any calculated coverage map is still "just a (computerized) guess".

Ocala 650 is a NGGMRS linked repeater, and access requests go through NGGMRS at www.nggmrs.org, and the PL tones and frequencies for ALL their repeaters are publicly available on their website, and no login or membership is required to view all this info. So, I don't see anything wrong with posting it here. The repeater owner, WQYU407, is not the NGGMRS club. He is a private individual who built a repeater network, and allows NGGMRS to use the network. If you didn't get a response, then you didn't hit the repeater. There are always people monitoring on this network, and the talk of gate codes and stuff does not sound like any sort of traffic you will normally hear on the NGGMRS net. NGGMRS allows guest usage of their network, but they do ask that if you use it regularly, that you become a paying member. Jonathan Ryan / WRVR303 / NGGMRS Tac Chattanooga 30

The Roger Beep may be on by default on your radio. Function shortcut F+7 toggles in on and off.

This was my solution for mounting an antenna at the peak of the eaves. It's a standard 24" wall mount, but because the eaves are 26", I had to add in an extender, using double pipe clamps. But, if those power lines are only 3' from the side of the house I would not even think about mounting there . I think I'd bolt or strap it to the chimney.

If you could be more specific about your location, a member familiar with your area might know exactly which repeater you could be hearing, too. Huntsville, AL? How many miles and in what direction from a major landmark or highway intersection?

When I was getting ready to install an antenna on my roof, I carefully read through the Reeves article several times. Then I bought a copy of the 2023 National Electrical Code (it's 900 pages) and proceeded to study it. Lets just say I followed Reeves to "T" because the NEC isn't exactly easily understood. (I suspect 9 out of 10 electricians couldn't understand it--they might know how to do everything to code, but not be able to read it, lol)

.For the first question, you don't need a repeater (linked or not) to access a repeater. You just need a radio & antenna setup capable of reaching the repeater--the higher the antenna, the greater the range. For the second, think of Zello as an app that lets your phone work like a radio, or talk to a radio such as a repeater. If the owner of a linked repeater, or more specifically a repeater with internet access, has installed Zello functionality, then you could use your phone to talk to a radio user or another Zello user via that repeater, and they can talk to you.

What about puttting up the tallest permissable "flagpole"?

I'm running a Laird FG 4605 on my roof. Fiber Glass 460+ MHz 5bB gain. (colinear design)

I live in a hollow and am surrounded on three sides. If it is truly line of sight to the repeaters, at 20-25 miles you probably don't even need a Yagi. If you want a "One and Done" solution, then the Yagi should be your first choice. If are also planning on eventually having a mobile unit in a vehicle, you could start with a mobile antenna on a piece of 2'x2' sheet metal just to see how good your Tx/Rx is. If you haven't already done this, a web site such as www.heywhatsthat.com lets you map the elevation profile between you and the repeater to see just how straight a shot it is. This image shows the terrain between my house and a nearby repeater. A 5W handheld with the stock antenna can barely hit the repeater; a 40W mobile with a 5dB Laird antenna on sheet metal on my porch is very clear. The same 5W handheld going through 70' of 1/2" hardline coax to a 5dB Laird on my roof is very clear on the repeater. (The antenna on the porch has to transmit "through" the house to get to the repeater.)

The Laird will be on the long side to start with. That is, a 450 MHz antenna is longer than a 470 MHz antenna, so you will need to cut it shorter. On a Laird 4505 I have the suggested cut lenghts were around 11-5/8" at 450 and 10-1/8" at 470, but per a NANO VNAH4, (and double checked with a Daiwa SWR meter), for 465 I stopped at 10-1/8". Don't cut your antenna based on my numbers, get the antenna cut chart for your exact model from Laird. On mine, there was a cut chart on the package. But, with your SWR meter, you can start cutting 1/8" at a time, until you make a cut and don't see any more change.

On my KG-935+ I could hear faint, weak signals a little better with the Nagoya 771 compared to the stock antenna. I also played around with both of them with a NanoVNA (knowing that trying measure SWR and such on a tiny HT antenna was basically a waste of time). When sweeping from 450-470 MHz the 771 actually showed a clearly defined "dip" with a significantly lower SWR of 1.5 to 2.0 around the 462-467 MHz range, while the stock antenna showed a fairly flat line across the 450-470 portion, staying in the 2.5 to 3:1 SWR range. Edit: I in spite of the above, I use the stock antenna because the length of the 771 was a PITA, bordering on PMEO (Poke My Eye Out)