Topband: What's the minimum distance one shud have between vertical and beverage?

[Fritz Reuning, K4OAQ]

Hi guys,

I'm wanting to move my 160 inverted L a little bit closer to where my 
beverages are located.  I have first hand experience that 30 ft is too 
close. Currently I have a quarter wavelength plus abt 30 additional feet 
between them.  Do the radials enter into the equation.  I.e., should you 
maintain a certain distance between the radials and the beverages.  Can the 
minimum distances be given in wavelengths and apply to any band (160 thu 
40), or are these distances a function of freq?

Tks in advance!

73, Fritz K4OAQ

Fritz@k4oaq.com