First, I'd either place all connections in a weatherproof box, like these sold on eBay;
http://cgi.ebay.com/ws/eBayISAPI.dl...&category=32843&sspagename=STRK:MESSE:IT&rd=1
http://cgi.ebay.com/ws/eBayISAPI.dl...&category=32843&sspagename=STRK:MESSE:IT&rd=1
If you do not enclose everything in weatherproof enclosures, I'd at lease mount all connections horizontally with the coax slanted downward, so that water does not flow into the connection.
For really good longevity, I'd use environmentally seal connectors like these Snap-N-Seal ones. Again, on eBay;
http://cgi.ebay.com/ws/eBayISAPI.dl...&category=11726&sspagename=STRK:MESSE:IT&rd=1
And, I place a dab of 100% non-hardening silicone grease on the center wire, before putting it into the socket. The 11-18 vDC current of the lnb switting voltage from the receiver make even water vapor at this point especially vulnerable.
Rubber or plastic boots are moisture collectors from rain and condensation and might even be harmful to the connection. I only use them for TV antennas or connections, when the coax goes downward from the connection, so any trapped moisture flows out of them.
The cable companies have learned from years of experience. They enclose as many connectors as possible in weatherproof boxes, and use the best enviornmentally sealed connectors. They have to service them for 10+ to 30 years in the future.
Satellite fulfillment installers care only that the install last not much longer than the chargeback period, and use only parts and connections that at least last that long.
Just like anything else, "You pay a little extra, now. Or, you pay a lot more later." If you plan to keep satellite for more than a year, you should consider the options I recommend. A DP34 switch lists for $119.99, not including shipping and installation. If one goes bad, on account of corroded connections, you'd have to replace them. Hopefully, there is enough slack in the coax, or the coax, too, will need replacement. Also, water can travel all the way down inside the coax.