Topband: Adjacent Pennants?

[WD3Q]

I am putting up two Pennants in by small city lot (140x40).  The size of 
the lot is forcing me to put them nose-to-feed as below:

Feed ----------------------------------------------------Nose


                                                   
                                    Feed
                                                  
                                    /
                     N ^                    
                                   /
                                            
                                  /
                                                                          /
                                                                      /
                                                                  /
                                                              /
                                                          / 
                                                      /
                                                  /
                                            Nose


The distance between the closest Nose/Feed is about 6 feet.   How much 
will this hurt the performance?

Any alternative solutions??

Thanks + 73,
Eric W3DQ
Washington,  DC