Cecil Moore wrote:

In a Beverage antenna, how much transmit power is lost in the
terminating resistor? We know a Beverage is a very inefficient
transmitting antenna. Could it be because it's a fairly efficient
transmission line? Or is it because of ground losses?

Model one with EZNEC to find out. At each end, put a few radial wires
just above the ground to connect the source and terminating resistors
to, and use High Accuracy ground. The Average Gain will tell you the
total loss which includes resistor and ground loss. Click the Load Dat
button to find the loss in the terminating resistor. From those you can
get the amount of ground loss.

Roy Lewallen, W7EL