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That defies the odds big time, hitting something that far away without seeing it first. Probably time to make an appointment with your optometrist, or just be more careful driving next time! (Sorry, couldn’t resist.) ...

What repeater is it? Are you sure it's transmitting a PL tone (vs just needing a tone to access the repeater)?

Here two tools I use to see I'm in range. Also verify the tone codes... most repeater I use do not use DCS codes. https://www.ve2dbe.com/rmonline_s.asp https://www.scadacore.com/tools/rf-path/rf-line-of-sight/ My choice...

How do you know it has a 40 miles range. If your going by the website be leary of range. Its not normally accurate. I would drive closer to the repeater and test.

I would not want that for the GMRS service. The truckers that use CB end up running illegal amps not all but you would be shocked by how many will openly admit it. Quite a few users splatter across adjacent channels, rendering them useless. Or they free band into Ham 10m bands, because of course no one is using them right? Now imagine that mentality in the beloved GMRS service. Where the 1kwatt amp is splattering across all the frequencies. In the sake of getting more distance out of a service that was implemented as a hassle free close coms. The biggest problem would be the FRS/GMRS bands are in most places adjacent to license business operations or EMS/Police/Public sector bands. The service is awesome for short distance coms. The ability to walk into Target or Walmart and pickup a radio for a caravan without going through the installation of a mobile or any real training on radio operations is incredibly awesome. As far as the FRS in the campground shops. Makes sense. Kids can play with it. Mommy and daddy can keep tabs on Billy without having to stare at him. You start to see GMRS mobile units in off road shops. Where the user normally doesn't want to fumble around with an HT while being tossed around in a truck. Been there done that, no thanks.

At the risk of sounding arrogant. I've said this before and will re post it again