These links are very useful if you intend to build your own Transmit antennas, Receive antennas, Preamps, powerspliters, etc.

Low Band RX antennas

W8JI - Everything about low bands
N1EU - Beverage Transformers
VE3NH - Preamps/Tx antennas/Rx antennas
WØBTU Beverage Receiving Antennas
WA1ION - Preamps/Vactrol
W7IUV - Preamp
W3LPL - Beverage dimensions
VA7ST - Beverages
ON7EQ - K9AY
SP3KEY - K9AY 4-square
TA1DX - Baluns
Carlos Gonçalves - K9AY
K9AY - How to make a great 9:1 transformer
160m/80m Antennas

JH3PRR - 160m and 80m Verticals
K9CT - 160m and 80m Vertical
VA7ST - 80m 2 element Vertical
G6PZ - 80m 4-square
GM4AFF - 80m vertical
IW5EDI - 80m vertical
Stations to follow

SJ2W - Mike SM2WMV
CN2R - Jim W7EJ
K1LZ - Krassy
F5IRO - Freddy