Jon,
It sounds like the tripod mounted system is the only practical solution for you. The antenna, along with the pre-mounted buc (a term they use for the transmitter/receiver), must be attached to the top of the previously set up surveyors tripod. It's not light, but can be done by one person. Then a double coax is connected between the antenna and the modem. By use of your computer, the firmware inside the modem will tell you the direction (azimuth), elevation, and skew for your particular zip code. Using a special compass and an OPI (basically a signal strength meter), you adjust the antenna to pick up the satellite you're assigned to, and peak the signal. Aside from setting up the hardware outside, finding the satellite, peaking the signal, and finally getting online can be done in 15 minutes or less after you've done it a few times.
Just curious: I've heard of trout fishing, bass fishing, salmon fishing, etc. but not kayak fishing. How big do the get and what kind of bait do you use? ;D