Steve,

I read further into the article and it states:

Larger Antennas

Several people have written to me to ask about making a larger LoG antenna than the 15' square that I am using. These have been people who tend to have large lots with plenty of extra space, such as at a rural home, or farm or ranch.

For any given frequency, making any small loop antenna larger will certainly increase the signal level. Whether this is helpful depends on the site details. If you connect the antenna to a running receiver, and the noise level goes up when you connect the antenna, and down when you disconnect it, you already have enough signal, and the antenna is large enough for that band. Even if the S-meter doesn't change, the goal is for the antenna to set the background noise level, and not the receiver. Since the loop isn't resonant, its size isn't critical, per se, as long as the loop is laid out on the ground in a symmetric pattern relative to the feedpoint axis.

RET