<< Graphics`Graphics`

a = 6.4  h

b = 3  h

c = 1.7  h

A = 1  h

GAMMA = 0.21

h = 0.7

LogLogPlot[((A (k^4))/(((1 + a k/GAMMA + (((b k/GAMMA))^(3/2)) + (((c k/GAMMA))^2)))^2)), {k, 1, (10^3)}]