My cheap GPS receiver works fine when placed on the window board. No problem with tracking several satellites, around 7-10 with a good/strong signal plus about 3-5 with a weak signal, even at a cloudy day. BTW, I'd suggest to add a proper grounding for the pole in case of a lightning. A 16mm² solid copper wire plus grounding rod should be sufficient. The ground of the antenna cable should be grounded too. Simply connect it to the grounded pole using a L-shaped metal with a patch connector for the antenna cable (sold by antenna shops, optional over-voltage protection) and connect the metal with a solid copper wire (4-6 mm²) to the pole. The L-shaped metal should be mounted where the cable enters the house (inside the house). If you got a grounding system for the house, you could also use that instead of the dedicated grounding rod. If you'll use a grounding rod and got a grounding system for your house, connect both to keep the potential the same. And please check out local regulations regarding grounding and lightning protection for antennas. Might be also a requirement by the building/fire insurance.