WRYZ926

Go with what works for you. The main thing is to be 1.8 or less on 462 and 467. An SWR of 2.0 will still work but 1.8 or less is better.

It is way easier to shorten an antenna versus lengthening one. This is where a cheap NanaVNA or an antenna analyzer comes in handy. You really need to know if the antenna is resonant above or below where you want it. I had to trim my Tram 1174 antenna. Before I made a single cut, I measured the SWR with an analyzer to see if it was high (short) or low (long). I made small 1/8" or less cuts testing the SWR after each cut. I did this until I was happy with the SWR. Remember to test at 467 MHz and at 462 MHz. You might get it spot on at 1.0 - 1.2 at one but be around 1.8 on the other. Or you might get both really close. I got my Tram to 1.3 at 462 MHz and 1.5 at 467 MHz. You will be fine as long as you are 1.8 or less on both 467 MHz and 462 MHz. Remember to cut just a tiny bit and test after each cut. If your lowest SWR is above your target frequency, then the antenna is too short. If the lowest SWR is below the target frequency, then the antenna is long and needs trimmed.

That is the easiest and fasted way to correct the issue. It would not cost much at all in the cost of redesign or materials to do that.

I finally bought a KG-Q10H. I've been happy with it so far. It works well on 2m and 70cm. I have only been able to talk to people within a few miles on 6m but it works and sounds good. I have yet to try out 1.25m since no one around uses that band. It definitely performs better than the Icom IC-T10 I have.

@marcspaz you're welcome. We are getting about 30- 35 mile radius from the repeater which is pretty good considering the terrain and forested areas in Central Missouri. Again the GMRS antennas are at 400 feet. We have about the same coverage area with our 70cm repeater even with its antennas at 900 feet. valleys and red cedar trees mess with UHF. Most of the dead spots I find on GMRS are the same for 70cm when I am mobile.

Or you get the fast "keyer's" that don't give others a chance to talk. I have seen a few guys that barely let the repeater drop out before they start talking. And we have one person that uses our 2m repeater that jumps into others conversations and derails things all of the time. That's when some of us will switch over to our 70cm or GMRS repeaters. That one person can't get into those two repeaters.

If my memory is correct, those work on the CB channel 14. Most of the Walkie Talkies from the 70's and 80's were on channel 14.

A lot of people have used cookie sheets under a mag mount mobile antenna for their base stations with good results. I did just that until I could get an actual base antenna installed.

I didn't pay any attention to the FCC ID when we received our BCR-40U back in November. We did not get the internal duplexer since we had better ones already. The repeater has been running for 6 months now with zero issues. A few of us definitely tested the repeater's duty cycle before opening it up to the public. Time will tell how the Bridgecom holds up over the long term. We have the repeater setup at 40 watts without the duplexer. So it is putting out 20-25 watts after the duplexer. What helps is having the antennas at 400 foot above ground.

Yes that will work fine too. Just try to keep it attached to a rail as far from the house as possible. Most base stations have radials and do not require anything else for a ground plane.

If you can afford to spend a little more, then most of us will highly suggest the Comet CA-712EFC base antenna. The Comet CA-712EFC will work right out of the box when fed with LMR400 or equivalent coax. They are between $135 and $140 depending on where you purchase. https://theantennafarm.com/shop-by-categories/antennas-mounts/base-antennas/gmrs-base-antennas/gmrs-omni-directional-base-antennas/1085-comet-ca-712efc-detail https://www.dxengineering.com/parts/cma-ca-712efc

In that case I will recommend using the Comet 2x4SR antenna if you have the clearance for a 38-40 inch tall antenna. I have not found any dual band antennas that are 20 inches or less that will work on 2m/70cm and GMRS.

Some dual band antennas will work fine for GMRS and some will not. The Comet GP3 and Comet GP9 antennas will work for GMRS.

I have the Wouxun KG-Q10H quad band hand held that does 2m, 1.25m, 70cm and 6m. I have talked to guys on 6m FM with it when they were only a few miles away from me. But I have not been able to talk to anyone farther away with it. Most hand held radios are going to be FM only on 6m. 6m is called the magic band since you have to wait for conditions to be just right to talk over longer distances. You would be better off with a mobile or base radio for working 6m. 10m is effected by the solar cycle too. Again a mobile or base radio would work better.

Another thing to consider is static electricity. Static will build up on your antennas and has to have somewhere to go. I would rather have static electricity go to an outside ground versus following the coax all the way to my equipment. The links provided are worth reading, even if they are long.

You answered your own question on how properly grounding would benefit a GMRS licensee. It doesn't matter what type of license you have, properly grounding your antenna system is for safety reasons per the National Electrical Code. I see this conversation going south quickly, especially if someone recommends putting the end of their coax in a glass jar during a storm. I will suggest that everyone reads the link that @Sshannon posted above.

Are you programming in the proper offset for the repeater channel? The offset should be set to a + 5 MHz.

Nothing wrong with Midland radios for their simplicity and ease of use. A lip mount or a magnet mount in the middle of the trunk lid should work fine on the Miata. I have used those devices that will allow the stock antenna to work for CB years ago. They never did work as well as a dedicated CB antenna. So you might want to look at two separate antennas for CB and GMRS.

Yes that was me that you talked to. Glad to hear you on the repeater.

Yes you can get into the repeater from around the 175 mile marker to the 170 mile marker. The you can pick it back up From Williamsburg , Mo to Columbia, Mo. I can get in to the repeater just fine with a 50 watt mobile and a Nagoya UT-72G antenna. The repeater is located in Mexico, Mo on the KWWR backup tower and the GMRS antennas are 400 feet above ground.

Another option is those little rubber vacuum hose caps from auto parts stores.

This is true and also why some of the cheap connectors from Amazon, eBay, etc, do not work as well nor last as long. That being said, I have not noticed any differences between the Amphenol connectors and those from DX Engineering or Max Gain when testing the cables and antenna SWR.

Here are the SO239 to SMA adaptors I have used with my Baofeng UV-5R and GT-5R https://www.amazon.com/gp/product/B00COKNKS8/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

Folded dipole antennas work well and are very common for repeater use. We are using them for our 2m, 70cm, and GMRS repeaters. All are mounted on a local radio station's 900 foot backup tower.

Yes you can program each repeater into separate memory channels. Just make sure to get the tones correct for each repeater. I also suggest giving each a unique name so you don't get them mixed up.