you could make the board so it fits with out falling out on it's own, yet removable so you could remove it and take it with you when your done...Then no one's the wiser how you do it unless they come up on you when your fishing...
Proud to have served with and supported the Units I was in: 1st IDF, 9th INF, 558th USAAG (Greece), 7th Transportation Brigade, 6th MEDSOM (Korea), III Corp, 8th IDF, 3rd Armor Div.
1980 Ebbtide Dyna-Trak 160 Evinrude 65 Triumphrawr215 LIKED above post
What about a shower curtain rod? Then you could adjust the length.
Cool video. Makes me wish I was sitting under a bridge now.
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Cheap aluminum bar clamp. Light weight and fast and removable....
36 in. Aluminum Bar Clamp
tie something to it that floats in case you drop it.
redfin00 LIKED above post
or a telescoping handle of some sort with rubber chair leg caps from lowes or home depot. 20-40" here.
Rubbermaid FGQ74500YL00 HYGEN 20" - 40" Yellow Quick-Connect Telescoping Handle
if you wanted to go between pillars. I like a bar clamp better as is gives you some clamping force to hold.
just another option.....