my solution
I usually tote a commercial 2.4GHZ flat panel antenna (I have 8dB, 14dB or 18dB antennas) and a USB Alfa 500mW adapter Model #AWUS036H along with some proper connecting wires. The antennas were all new, bought on ebay for $25-$40 incl S&H and the Alpha sells for about $60 new on ebay etc. Since hotel internet in Europe hotels usually runs 20-40 euros/day you can save your equipment cost in 2-3 days. My best guess is I used my wifi setup over 50-60 days in Europe and 20-30 days elsewhere over the past couple years. Only once did the TSA ever want to inspect the flat panel antenna. The rig weighs 2-4 lb depending upon the antenna to be used and usually is packed in my 22" Costco wheelie and carried aboard. Just point it out the hotel window, scan for a open signal and surf. My best guess the 18dB unit range is 3000+ ft and the 14dB is 2000+ ft connecting with typical hotspot power.
MisterNice