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You wont need a pre amp with the Altronics kit. Its almost exactly the same thing as the proper 'Radio Jove' receiver.
Make sure that the antenna (I presume your using the Radio Jove design twin dipole) and the co-ax downfeed are cut to the exact length for the frequency your working with (20.1 Mhz ?).
The coax from the splitter to the receiver of the Radio Jove antenna needs to be an integer multiple of the wavelength to which the antenna and receiver are tuned. Our target frequency is 20.1 MHz or a wavelength of 3 x 10^8 / 20.1 x 10^6 = 14.925m. This is multiplied by the velocity factor of the coax to compute the actual length of coax required. For example, coax with a velocity factor of 66% needs to be units of 14.925 x 0.66 = 9.85m long.
Greg
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