Alinco http://www.alinco.com

Alpha Delta Communications http://www.alphadeltacom.com/

Amateur Electronic Supply http://www.aesham.com

Amidon: Iron powder, ferrite cores, baluns http://www.amidoncorp.com

Andrew Corp http://www.andrew.com

Bencher-Skyhawk http://www.bencher.com

Bob Myers Communications (Gladiator Antennas) http://www.primenet.com/~bmyers

Command Technologies http://www.command1.com/

Cubex Quad Antennas http://cubex.com/

Cushcraft http://www.cushcraft.com

DX Engineering (Harbach antenna parts) http://www.dxengineering.com/

Eimac http://www.eimac.com

ELNEC, EZNEC http://www.teleport.com/~w7el

Force 12 http://www.Force12inc.com

G1MFG; Synthesized ATV transmitters & receivers http://www.g1mfg.com/

Gap Antennas  http://www.gapantenna.com/index2.htm

GeoClock http://home.att.net/~geoclock/index.html

Gladiator antennas http://www.primenet.com/~bmyers

Glenn Martin towers http://www.glenmartin.com

Harbach Electronics (Heathkit parts from Jeff Weinberg, W8CQ) http://www.harbachelectronics.com/
    (See also DX Engineering above for Harbach atnenna hardware)

Heil Sound http://www.heilsound.com

HRO http://www.hamradio.com

Hy-Gain http://www.hy-gain.com/hy-gain/index.php

Intuitive Circuits LLC http://www.icircuits.com/

K-Com http://www.k-comfilters.com

Lightning Bolt Quads http://lbq.isrv.com

M-Squared Antennas http://www.m2inc.com

MFJ Enterprises  http://www.mfjenterprises.com/index.php

Parts, tubes and other hardware:
    RF Parts  http://www.rfparts.com/
    Surplus Sales of Nebraska http://www.surplussales.com/

Polyphaser http://www.polyphaser.com

Radio Works http://www.radioworks.com/hpcatalog.html

RF Connection http://www.therfc.com/

RF Parts http://www.rfparts.com

Rohn http://www.rohnnet.com

Sommer Antennas http://www.sommerantennas.com

Texas Towers http://www.texastowers.com

The Wireman http://www.thewireman.com/

US Tower http://www.firstcallcom.net

Vibroplex http://www.vibroplex.com

WT4I Contest Tools http://wt4i.com/