Look on the "Blueprints" page of the section from your link: link
"Tank T-26-1 mod. 1940, equipped with radio transmitter. It has a sloping hull below the turret and a conical turret with punched gun mask, commander's "PTK" periscope and whip antenna.[1]"
--M. Kolomiets, M. Svirin,"T-26 Legkiy Tank" Frontovaya Illystratsiya, No. 1, 2003
"Tanks intended for company commanders were equipped with a radio set and a hand-rail radio antenna on the turret. Later the hand-rail antenna was replaced with a buggy-whip antenna, because the Spanish Civil War and Battle of Lake Khasan demonstrated that the hand-rail antenna unmasked commander tanks for enemy fire."
"After 1937, all tanks started to equip with a 71-TK-3 radio."
(They're talking about receivers only. Scale of deployment is a matter of debate.)
link (Says they were for the BTs, but link for example, shows the installation location in the turret bustle. Finnish experiences confirm this (http://www.jaegerplatoon.net/TANKS3.htm):
"Later T-26 tank models were sometimes equipped with radio, but these tanks were a minority of the manufactured tanks. The first radio that the Soviets used for equipping T-26 model 1933 tanks was 71-TK-1 and later production vehicles were equipped with 71-TK-3. … As mentioned in earlier with armoured cars and T-26E tanks, the Finnish experiences concerning captured 71-TK-1 and 71-TK-3 radios were not too positive. Before Continuation War these captured radios had been installed to T-26 tanks reserved for tank company and tank platoon commanders, but these radios proved unreliable. The original receiver used in them had a tendency of constantly more or less changing its frequency on its own, which made reception of radio transmissions uncertain."
shows off the U.S. infantry from the Flames of War starter set.
