So extend the serial side.  Serial cable is MUCH cheaper than RF cable.

On 18/03/2012, at 7:20 AM, Dave Taht wrote:

> I'm fully aware that adding an external antenna can blow the costs out
> the window. However, getting a gps receiver with integral antenna to a
> window is something of a problem. So far as I know 5 meters is the
> outer limit without active regeneration of the signal.
> 
> http://reviews.ebay.com/USB-Cable-Length-Limitations-and-how-to-break-them?ugid=10000000001067998
> 
> I have no idea how usb 'active regeneration' works or if it can affect latency.
> 
> So moving onto the antenna problem, I note that the length of a patch
> antenna has a direct relationship as to the quality of it's signal,
> so this is a determining factor as to the overall size of the dongle.
> 
> (this is a most-excellent manual, and has details that apply to all gps designs)
> 
> http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_NEO-6_MAX-6_HardwareIntegrationManual_%28GPS.G6-HW-09007%29.pdf
> 
> There are also outboard antennas with varying features (like the
> ability to be mounted oddly) and active antenna designs. I don't know
> enough about the active antenna designs to know if they can be powered
> by a usb source.
> 
> -- 
> Dave Täht
> SKYPE: davetaht
> US Tel: 1-239-829-5608
> http://www.bufferbloat.net
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