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I would be very surprised if an external antenna makes a difference. In the consumer world, antennas are typically only used when the device is inside a vehicle that has obstructions. The 60 series (GPSMap 60/62/64) has a quad helix antenna that many people feel is the best in the business already.
Tim's point about expectations is right on target. Consumer devices like the 64 are not likely to give you any better than +/- 5 meters regardless of what you do. The very expensive antennas you have seen are probably intended for use with specialized survey grade gps units that cost thousands of dollars. In the consumer space, spending more money is not likely to give you more accuracy. A ~$100 device like the eTrex 10 is going to be just as accurate as the ~$700 Monterra. Spending more money just gets you more "bells and whistles".
To get the best accuracy with your 64, use the "waypoint averaging" feature. If you stand stationary, the device takes a position fix every second and averages the results. This usually gives better accuracy, but there are a lot of variables such as the position of the satellites at the time you take the measurements.
According to Garmin, this is the coverage of the UK and Ireland map. As for the rest, I'd say that's between you and the place where you bought it…
You could check with this company, they repair out of warranty devices. The owner is a member here. http://www.sharc.net/gps_repair.htm
But you really have to ask yourself whether it would be cost effective, since new devices have gotten so inexpensive...
I've read that people are using these with no SIM card or data connection as a replacement for a dedicated GPS, specs are impressive and street price a little over $100. No personal experience with them though.
Yeah, I would not sink that kind of money into an old device the probably has a limited lifespan. Get a factory refurb nuvi, it will have a one year warranty as well as lifetime maps.
Here's something strange that was just pointed out in a thread at groundspeak; these devices are not compatible with Garmin maps and don't have memory card slots. Kind of surprising - see the fine print at the bottom of the page here: https://buy.garmin.com/en-US/US/p/561269/pn/010-01735-10#overview
"Preloaded DeLorme TOPO maps are not compatible with other Garmin devices. Other Garmin maps not compatible with this device."
Tim is right, this really isn't a "Garmin like" product. ;)