• Burgess, S. J., and N. E. Evans (1999), Short-haul communications using NVIS HF radio, Electron. Commun. Eng. J., 11(2), 95104, doi:10.1049/ecej:19990205.
  • Davies, K. (1965), Ionospheric Radio Propagation, Natl. Bur. of Stand. Monogr., vol. 80, Natl. Bur. of Stand., Washington, D. C.
  • Davies, K. (1990), Ionospheric Radio, Peter Peregrinus, London, doi:10.1049/PBEW031E.
  • Fiedler, D. M., and E. J. Farmer (1996), Near-Vertical Incidence Skywave Communications: Theory, Techniques and Validation, Worldradio, Sacramento, Calif.
  • Goodman, J. M. (1992), HF Communications: Science and Technology, Van Nostrand Reinhold, New York.
  • Hagn, G. H. (1973), On the relative response and absolute gain toward the zenith of HF field-expedient antennas—Measured with an ionospheric sounder, IEEE Trans. Antennas Propag., 21(4), 571574, doi:10.1109/TAP.1973.1140544.
  • Huang, X., and B. W. Reinisch (2006), Real-time HF ray tracing through a tilted ionosphere, Radio Sci., 41, RS5S47, doi:10.1029/2005RS003378.
  • International Telecommunication Union (2009), Method for the prediction of the performance of HF circuits, Recomm. ITU-R P.533-10, Geneva, Switzerland.
  • IPS Radio and Space Services (2009), ASAPS for Windows V5.3 tutorial, Sydney, N. S. W., Australia.
  • Johnson, E. E. (2007), NVIS communications during the solar minimum, paper presented at MILCOM 2007, Armed Forces Commun. and Electron. Assoc., Orlando, Fla.
  • Lane, G. (2001), Signal-to-Noise Predictions Using VOACAP—A Users Guide, Rockwell-Collins, Cedar Rapids, Iowa.
  • McNamara, L. F., R. J. Barton, and T. W. Bullett (2006), Analysis of HF signal power observations on two North American circuits, Radio Sci., 41, RS5S38, doi:10.1029/2005RS003347.
  • McNamara, L. F., T. W. Bullett, E. Mishin, and Y. M. Yampolski (2008), Nighttime above-the-MUF HF propagation on a midlatitude circuit, Radio Sci., 43, RS2004, doi:10.1029/2007RS003742.
  • Schwentek, H., W. Elling, and M. Peres (1980), Asymmetry in the winter-anomalous behaviour of absorption at midlatitudes in the northern and southern hemispheres, J. Atmos. Terr. Phys., 42(6), 545552, doi:10.1016/0021-9169(80)90064-1.
  • Straw, N. D. (2003), The ARRL Antenna Book, 20th ed., Am. Radio Relay League, Newington, Conn.
  • Talbot, A. (2005a), Design and construction of the 5 MHz beacons GB3RAL, GB3WES and GB3ORK—Part one, RadCom, 81(6), 8587.
  • Talbot, A. (2005b), Design and construction of the 5 MHz beacons GB3RAL, GB3WES and GB3ORK—Part two, RadCom, 81(7), 8889.
  • Walden, M. C. (2010), A comparison of measurements and propagation simulations for mid-latitude HF NVIS links at 5 MHz during sunspot minima, paper presented at the Nordic Shortwave Conference HF 10, Nord. Radio Soc., Fårö, Sweden.
  • Walden, M. C. (2011), Comparison of propagation predictions and measurements for mid-latitude HF NVIS links at 5 MHz, paper presented at the 13th International Ionospheric Effects Symposium IES2011, Off. of Nav. Res., Alexandria, Va.